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ab9953ff | 1 | // SPDX-License-Identifier: GPL-2.0 |
293d984f | 2 | /* |
b8a2d42a | 3 | * Copyright IBM Corp. 2001, 2009 |
293d984f PT |
4 | * Author(s): |
5 | * Original CTC driver(s): | |
6 | * Fritz Elfert (felfert@millenux.com) | |
7 | * Dieter Wellerdiek (wel@de.ibm.com) | |
8 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
9 | * Denis Joseph Barrow (barrow_dj@yahoo.com) | |
10 | * Jochen Roehrig (roehrig@de.ibm.com) | |
11 | * Cornelia Huck <cornelia.huck@de.ibm.com> | |
12 | * MPC additions: | |
13 | * Belinda Thompson (belindat@us.ibm.com) | |
14 | * Andy Richter (richtera@us.ibm.com) | |
15 | * Revived by: | |
16 | * Peter Tiedemann (ptiedem@de.ibm.com) | |
17 | */ | |
18 | ||
19 | #undef DEBUG | |
20 | #undef DEBUGDATA | |
21 | #undef DEBUGCCW | |
22 | ||
2a7c6f2c PT |
23 | #define KMSG_COMPONENT "ctcm" |
24 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
25 | ||
293d984f PT |
26 | #include <linux/module.h> |
27 | #include <linux/init.h> | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/interrupt.h> | |
33 | #include <linux/timer.h> | |
34 | #include <linux/bitops.h> | |
35 | ||
36 | #include <linux/signal.h> | |
37 | #include <linux/string.h> | |
38 | ||
39 | #include <linux/ip.h> | |
40 | #include <linux/if_arp.h> | |
41 | #include <linux/tcp.h> | |
42 | #include <linux/skbuff.h> | |
43 | #include <linux/ctype.h> | |
44 | #include <net/dst.h> | |
45 | ||
46 | #include <linux/io.h> | |
47 | #include <asm/ccwdev.h> | |
48 | #include <asm/ccwgroup.h> | |
49 | #include <linux/uaccess.h> | |
50 | ||
51 | #include <asm/idals.h> | |
52 | ||
293d984f PT |
53 | #include "ctcm_fsms.h" |
54 | #include "ctcm_main.h" | |
55 | ||
56 | /* Some common global variables */ | |
57 | ||
0ca8cc6f UB |
58 | /** |
59 | * The root device for ctcm group devices | |
60 | */ | |
61 | static struct device *ctcm_root_dev; | |
62 | ||
293d984f PT |
63 | /* |
64 | * Linked list of all detected channels. | |
65 | */ | |
66 | struct channel *channels; | |
67 | ||
68 | /** | |
69 | * Unpack a just received skb and hand it over to | |
70 | * upper layers. | |
71 | * | |
72 | * ch The channel where this skb has been received. | |
73 | * pskb The received skb. | |
74 | */ | |
75 | void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb) | |
76 | { | |
77 | struct net_device *dev = ch->netdev; | |
261893d3 | 78 | struct ctcm_priv *priv = dev->ml_priv; |
293d984f PT |
79 | __u16 len = *((__u16 *) pskb->data); |
80 | ||
81 | skb_put(pskb, 2 + LL_HEADER_LENGTH); | |
82 | skb_pull(pskb, 2); | |
83 | pskb->dev = dev; | |
84 | pskb->ip_summed = CHECKSUM_UNNECESSARY; | |
85 | while (len > 0) { | |
86 | struct sk_buff *skb; | |
87 | int skblen; | |
88 | struct ll_header *header = (struct ll_header *)pskb->data; | |
89 | ||
90 | skb_pull(pskb, LL_HEADER_LENGTH); | |
91 | if ((ch->protocol == CTCM_PROTO_S390) && | |
92 | (header->type != ETH_P_IP)) { | |
293d984f | 93 | if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) { |
aa3f2cb6 | 94 | ch->logflags |= LOG_FLAG_ILLEGALPKT; |
293d984f PT |
95 | /* |
96 | * Check packet type only if we stick strictly | |
97 | * to S/390's protocol of OS390. This only | |
98 | * supports IP. Otherwise allow any packet | |
99 | * type. | |
100 | */ | |
aa3f2cb6 PT |
101 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
102 | "%s(%s): Illegal packet type 0x%04x" | |
103 | " - dropping", | |
104 | CTCM_FUNTAIL, dev->name, header->type); | |
293d984f | 105 | } |
293d984f PT |
106 | priv->stats.rx_dropped++; |
107 | priv->stats.rx_frame_errors++; | |
108 | return; | |
109 | } | |
5cd77c13 | 110 | pskb->protocol = cpu_to_be16(header->type); |
fb8585fc RK |
111 | if ((header->length <= LL_HEADER_LENGTH) || |
112 | (len <= LL_HEADER_LENGTH)) { | |
293d984f | 113 | if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) { |
aa3f2cb6 PT |
114 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
115 | "%s(%s): Illegal packet size %d(%d,%d)" | |
116 | "- dropping", | |
117 | CTCM_FUNTAIL, dev->name, | |
118 | header->length, dev->mtu, len); | |
293d984f PT |
119 | ch->logflags |= LOG_FLAG_ILLEGALSIZE; |
120 | } | |
121 | ||
122 | priv->stats.rx_dropped++; | |
123 | priv->stats.rx_length_errors++; | |
124 | return; | |
125 | } | |
126 | header->length -= LL_HEADER_LENGTH; | |
127 | len -= LL_HEADER_LENGTH; | |
128 | if ((header->length > skb_tailroom(pskb)) || | |
5cd77c13 | 129 | (header->length > len)) { |
293d984f | 130 | if (!(ch->logflags & LOG_FLAG_OVERRUN)) { |
aa3f2cb6 PT |
131 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
132 | "%s(%s): Packet size %d (overrun)" | |
133 | " - dropping", CTCM_FUNTAIL, | |
134 | dev->name, header->length); | |
293d984f PT |
135 | ch->logflags |= LOG_FLAG_OVERRUN; |
136 | } | |
137 | ||
138 | priv->stats.rx_dropped++; | |
139 | priv->stats.rx_length_errors++; | |
140 | return; | |
141 | } | |
142 | skb_put(pskb, header->length); | |
143 | skb_reset_mac_header(pskb); | |
144 | len -= header->length; | |
145 | skb = dev_alloc_skb(pskb->len); | |
146 | if (!skb) { | |
147 | if (!(ch->logflags & LOG_FLAG_NOMEM)) { | |
aa3f2cb6 PT |
148 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
149 | "%s(%s): MEMORY allocation error", | |
150 | CTCM_FUNTAIL, dev->name); | |
293d984f PT |
151 | ch->logflags |= LOG_FLAG_NOMEM; |
152 | } | |
153 | priv->stats.rx_dropped++; | |
154 | return; | |
155 | } | |
156 | skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len), | |
157 | pskb->len); | |
158 | skb_reset_mac_header(skb); | |
159 | skb->dev = pskb->dev; | |
160 | skb->protocol = pskb->protocol; | |
161 | pskb->ip_summed = CHECKSUM_UNNECESSARY; | |
162 | skblen = skb->len; | |
163 | /* | |
164 | * reset logflags | |
165 | */ | |
166 | ch->logflags = 0; | |
167 | priv->stats.rx_packets++; | |
168 | priv->stats.rx_bytes += skblen; | |
169 | netif_rx_ni(skb); | |
293d984f PT |
170 | if (len > 0) { |
171 | skb_pull(pskb, header->length); | |
172 | if (skb_tailroom(pskb) < LL_HEADER_LENGTH) { | |
e2fc8cb4 JF |
173 | CTCM_DBF_DEV_NAME(TRACE, dev, |
174 | "Overrun in ctcm_unpack_skb"); | |
175 | ch->logflags |= LOG_FLAG_OVERRUN; | |
293d984f PT |
176 | return; |
177 | } | |
178 | skb_put(pskb, LL_HEADER_LENGTH); | |
179 | } | |
180 | } | |
181 | } | |
182 | ||
183 | /** | |
184 | * Release a specific channel in the channel list. | |
185 | * | |
186 | * ch Pointer to channel struct to be released. | |
187 | */ | |
188 | static void channel_free(struct channel *ch) | |
189 | { | |
aa3f2cb6 | 190 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id); |
293d984f PT |
191 | ch->flags &= ~CHANNEL_FLAGS_INUSE; |
192 | fsm_newstate(ch->fsm, CTC_STATE_IDLE); | |
193 | } | |
194 | ||
195 | /** | |
196 | * Remove a specific channel in the channel list. | |
197 | * | |
198 | * ch Pointer to channel struct to be released. | |
199 | */ | |
200 | static void channel_remove(struct channel *ch) | |
201 | { | |
202 | struct channel **c = &channels; | |
203 | char chid[CTCM_ID_SIZE+1]; | |
204 | int ok = 0; | |
205 | ||
206 | if (ch == NULL) | |
207 | return; | |
208 | else | |
209 | strncpy(chid, ch->id, CTCM_ID_SIZE); | |
210 | ||
211 | channel_free(ch); | |
212 | while (*c) { | |
213 | if (*c == ch) { | |
214 | *c = ch->next; | |
215 | fsm_deltimer(&ch->timer); | |
216 | if (IS_MPC(ch)) | |
217 | fsm_deltimer(&ch->sweep_timer); | |
218 | ||
219 | kfree_fsm(ch->fsm); | |
220 | clear_normalized_cda(&ch->ccw[4]); | |
221 | if (ch->trans_skb != NULL) { | |
222 | clear_normalized_cda(&ch->ccw[1]); | |
223 | dev_kfree_skb_any(ch->trans_skb); | |
224 | } | |
225 | if (IS_MPC(ch)) { | |
226 | tasklet_kill(&ch->ch_tasklet); | |
227 | tasklet_kill(&ch->ch_disc_tasklet); | |
228 | kfree(ch->discontact_th); | |
229 | } | |
230 | kfree(ch->ccw); | |
231 | kfree(ch->irb); | |
232 | kfree(ch); | |
233 | ok = 1; | |
234 | break; | |
235 | } | |
236 | c = &((*c)->next); | |
237 | } | |
238 | ||
239 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL, | |
240 | chid, ok ? "OK" : "failed"); | |
241 | } | |
242 | ||
243 | /** | |
244 | * Get a specific channel from the channel list. | |
245 | * | |
246 | * type Type of channel we are interested in. | |
247 | * id Id of channel we are interested in. | |
248 | * direction Direction we want to use this channel for. | |
249 | * | |
250 | * returns Pointer to a channel or NULL if no matching channel available. | |
251 | */ | |
0ca8cc6f | 252 | static struct channel *channel_get(enum ctcm_channel_types type, |
293d984f PT |
253 | char *id, int direction) |
254 | { | |
255 | struct channel *ch = channels; | |
256 | ||
293d984f PT |
257 | while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type))) |
258 | ch = ch->next; | |
259 | if (!ch) { | |
aa3f2cb6 PT |
260 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
261 | "%s(%d, %s, %d) not found in channel list\n", | |
293d984f | 262 | CTCM_FUNTAIL, type, id, direction); |
293d984f PT |
263 | } else { |
264 | if (ch->flags & CHANNEL_FLAGS_INUSE) | |
265 | ch = NULL; | |
266 | else { | |
267 | ch->flags |= CHANNEL_FLAGS_INUSE; | |
268 | ch->flags &= ~CHANNEL_FLAGS_RWMASK; | |
3c09e264 | 269 | ch->flags |= (direction == CTCM_WRITE) |
293d984f PT |
270 | ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ; |
271 | fsm_newstate(ch->fsm, CTC_STATE_STOPPED); | |
272 | } | |
273 | } | |
274 | return ch; | |
275 | } | |
276 | ||
277 | static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb) | |
278 | { | |
279 | if (!IS_ERR(irb)) | |
280 | return 0; | |
281 | ||
aa3f2cb6 PT |
282 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN, |
283 | "irb error %ld on device %s\n", | |
2a0217d5 | 284 | PTR_ERR(irb), dev_name(&cdev->dev)); |
293d984f PT |
285 | |
286 | switch (PTR_ERR(irb)) { | |
287 | case -EIO: | |
2a7c6f2c PT |
288 | dev_err(&cdev->dev, |
289 | "An I/O-error occurred on the CTCM device\n"); | |
293d984f PT |
290 | break; |
291 | case -ETIMEDOUT: | |
2a7c6f2c PT |
292 | dev_err(&cdev->dev, |
293 | "An adapter hardware operation timed out\n"); | |
293d984f PT |
294 | break; |
295 | default: | |
2a7c6f2c PT |
296 | dev_err(&cdev->dev, |
297 | "An error occurred on the adapter hardware\n"); | |
293d984f PT |
298 | } |
299 | return PTR_ERR(irb); | |
300 | } | |
301 | ||
302 | ||
303 | /** | |
304 | * Check sense of a unit check. | |
305 | * | |
306 | * ch The channel, the sense code belongs to. | |
307 | * sense The sense code to inspect. | |
308 | */ | |
cef6ff22 | 309 | static void ccw_unit_check(struct channel *ch, __u8 sense) |
293d984f | 310 | { |
aa3f2cb6 PT |
311 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, |
312 | "%s(%s): %02x", | |
313 | CTCM_FUNTAIL, ch->id, sense); | |
314 | ||
293d984f PT |
315 | if (sense & SNS0_INTERVENTION_REQ) { |
316 | if (sense & 0x01) { | |
aa3f2cb6 | 317 | if (ch->sense_rc != 0x01) { |
2a7c6f2c PT |
318 | pr_notice( |
319 | "%s: The communication peer has " | |
320 | "disconnected\n", ch->id); | |
aa3f2cb6 PT |
321 | ch->sense_rc = 0x01; |
322 | } | |
293d984f PT |
323 | fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch); |
324 | } else { | |
aa3f2cb6 | 325 | if (ch->sense_rc != SNS0_INTERVENTION_REQ) { |
2a7c6f2c PT |
326 | pr_notice( |
327 | "%s: The remote operating system is " | |
328 | "not available\n", ch->id); | |
aa3f2cb6 PT |
329 | ch->sense_rc = SNS0_INTERVENTION_REQ; |
330 | } | |
293d984f PT |
331 | fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch); |
332 | } | |
333 | } else if (sense & SNS0_EQUIPMENT_CHECK) { | |
334 | if (sense & SNS0_BUS_OUT_CHECK) { | |
aa3f2cb6 PT |
335 | if (ch->sense_rc != SNS0_BUS_OUT_CHECK) { |
336 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, | |
337 | "%s(%s): remote HW error %02x", | |
338 | CTCM_FUNTAIL, ch->id, sense); | |
339 | ch->sense_rc = SNS0_BUS_OUT_CHECK; | |
340 | } | |
293d984f PT |
341 | fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch); |
342 | } else { | |
aa3f2cb6 PT |
343 | if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) { |
344 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, | |
345 | "%s(%s): remote read parity error %02x", | |
346 | CTCM_FUNTAIL, ch->id, sense); | |
347 | ch->sense_rc = SNS0_EQUIPMENT_CHECK; | |
348 | } | |
293d984f PT |
349 | fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch); |
350 | } | |
351 | } else if (sense & SNS0_BUS_OUT_CHECK) { | |
aa3f2cb6 PT |
352 | if (ch->sense_rc != SNS0_BUS_OUT_CHECK) { |
353 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, | |
354 | "%s(%s): BUS OUT error %02x", | |
355 | CTCM_FUNTAIL, ch->id, sense); | |
356 | ch->sense_rc = SNS0_BUS_OUT_CHECK; | |
357 | } | |
358 | if (sense & 0x04) /* data-streaming timeout */ | |
293d984f | 359 | fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch); |
aa3f2cb6 | 360 | else /* Data-transfer parity error */ |
293d984f | 361 | fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch); |
293d984f | 362 | } else if (sense & SNS0_CMD_REJECT) { |
aa3f2cb6 PT |
363 | if (ch->sense_rc != SNS0_CMD_REJECT) { |
364 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, | |
365 | "%s(%s): Command rejected", | |
366 | CTCM_FUNTAIL, ch->id); | |
367 | ch->sense_rc = SNS0_CMD_REJECT; | |
368 | } | |
293d984f | 369 | } else if (sense == 0) { |
aa3f2cb6 PT |
370 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, |
371 | "%s(%s): Unit check ZERO", | |
372 | CTCM_FUNTAIL, ch->id); | |
293d984f PT |
373 | fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch); |
374 | } else { | |
aa3f2cb6 PT |
375 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, |
376 | "%s(%s): Unit check code %02x unknown", | |
377 | CTCM_FUNTAIL, ch->id, sense); | |
293d984f PT |
378 | fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch); |
379 | } | |
380 | } | |
381 | ||
382 | int ctcm_ch_alloc_buffer(struct channel *ch) | |
383 | { | |
293d984f PT |
384 | clear_normalized_cda(&ch->ccw[1]); |
385 | ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA); | |
386 | if (ch->trans_skb == NULL) { | |
aa3f2cb6 PT |
387 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
388 | "%s(%s): %s trans_skb allocation error", | |
389 | CTCM_FUNTAIL, ch->id, | |
3c09e264 UB |
390 | (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? |
391 | "RX" : "TX"); | |
293d984f PT |
392 | return -ENOMEM; |
393 | } | |
394 | ||
395 | ch->ccw[1].count = ch->max_bufsize; | |
396 | if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) { | |
397 | dev_kfree_skb(ch->trans_skb); | |
398 | ch->trans_skb = NULL; | |
aa3f2cb6 PT |
399 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
400 | "%s(%s): %s set norm_cda failed", | |
401 | CTCM_FUNTAIL, ch->id, | |
3c09e264 UB |
402 | (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? |
403 | "RX" : "TX"); | |
293d984f PT |
404 | return -ENOMEM; |
405 | } | |
406 | ||
407 | ch->ccw[1].count = 0; | |
408 | ch->trans_skb_data = ch->trans_skb->data; | |
409 | ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED; | |
410 | return 0; | |
411 | } | |
412 | ||
413 | /* | |
414 | * Interface API for upper network layers | |
415 | */ | |
416 | ||
417 | /** | |
418 | * Open an interface. | |
419 | * Called from generic network layer when ifconfig up is run. | |
420 | * | |
421 | * dev Pointer to interface struct. | |
422 | * | |
423 | * returns 0 on success, -ERRNO on failure. (Never fails.) | |
424 | */ | |
425 | int ctcm_open(struct net_device *dev) | |
426 | { | |
261893d3 | 427 | struct ctcm_priv *priv = dev->ml_priv; |
293d984f PT |
428 | |
429 | CTCMY_DBF_DEV_NAME(SETUP, dev, ""); | |
430 | if (!IS_MPC(priv)) | |
431 | fsm_event(priv->fsm, DEV_EVENT_START, dev); | |
432 | return 0; | |
433 | } | |
434 | ||
435 | /** | |
436 | * Close an interface. | |
437 | * Called from generic network layer when ifconfig down is run. | |
438 | * | |
439 | * dev Pointer to interface struct. | |
440 | * | |
441 | * returns 0 on success, -ERRNO on failure. (Never fails.) | |
442 | */ | |
443 | int ctcm_close(struct net_device *dev) | |
444 | { | |
261893d3 | 445 | struct ctcm_priv *priv = dev->ml_priv; |
293d984f PT |
446 | |
447 | CTCMY_DBF_DEV_NAME(SETUP, dev, ""); | |
448 | if (!IS_MPC(priv)) | |
449 | fsm_event(priv->fsm, DEV_EVENT_STOP, dev); | |
450 | return 0; | |
451 | } | |
452 | ||
453 | ||
454 | /** | |
455 | * Transmit a packet. | |
456 | * This is a helper function for ctcm_tx(). | |
457 | * | |
458 | * ch Channel to be used for sending. | |
459 | * skb Pointer to struct sk_buff of packet to send. | |
460 | * The linklevel header has already been set up | |
461 | * by ctcm_tx(). | |
462 | * | |
463 | * returns 0 on success, -ERRNO on failure. (Never fails.) | |
464 | */ | |
465 | static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb) | |
466 | { | |
467 | unsigned long saveflags; | |
468 | struct ll_header header; | |
469 | int rc = 0; | |
470 | __u16 block_len; | |
471 | int ccw_idx; | |
472 | struct sk_buff *nskb; | |
473 | unsigned long hi; | |
474 | ||
475 | /* we need to acquire the lock for testing the state | |
476 | * otherwise we can have an IRQ changing the state to | |
477 | * TXIDLE after the test but before acquiring the lock. | |
478 | */ | |
479 | spin_lock_irqsave(&ch->collect_lock, saveflags); | |
480 | if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) { | |
481 | int l = skb->len + LL_HEADER_LENGTH; | |
482 | ||
483 | if (ch->collect_len + l > ch->max_bufsize - 2) { | |
484 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
485 | return -EBUSY; | |
486 | } else { | |
63354797 | 487 | refcount_inc(&skb->users); |
293d984f | 488 | header.length = l; |
5cd77c13 | 489 | header.type = be16_to_cpu(skb->protocol); |
293d984f PT |
490 | header.unused = 0; |
491 | memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, | |
492 | LL_HEADER_LENGTH); | |
493 | skb_queue_tail(&ch->collect_queue, skb); | |
494 | ch->collect_len += l; | |
495 | } | |
496 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
497 | goto done; | |
498 | } | |
499 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
500 | /* | |
501 | * Protect skb against beeing free'd by upper | |
502 | * layers. | |
503 | */ | |
63354797 | 504 | refcount_inc(&skb->users); |
293d984f PT |
505 | ch->prof.txlen += skb->len; |
506 | header.length = skb->len + LL_HEADER_LENGTH; | |
5cd77c13 | 507 | header.type = be16_to_cpu(skb->protocol); |
293d984f PT |
508 | header.unused = 0; |
509 | memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH); | |
510 | block_len = skb->len + 2; | |
511 | *((__u16 *)skb_push(skb, 2)) = block_len; | |
512 | ||
513 | /* | |
514 | * IDAL support in CTCM is broken, so we have to | |
515 | * care about skb's above 2G ourselves. | |
516 | */ | |
517 | hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31; | |
518 | if (hi) { | |
519 | nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); | |
520 | if (!nskb) { | |
63354797 | 521 | refcount_dec(&skb->users); |
293d984f PT |
522 | skb_pull(skb, LL_HEADER_LENGTH + 2); |
523 | ctcm_clear_busy(ch->netdev); | |
524 | return -ENOMEM; | |
525 | } else { | |
59ae1d12 | 526 | skb_put_data(nskb, skb->data, skb->len); |
63354797 RE |
527 | refcount_inc(&nskb->users); |
528 | refcount_dec(&skb->users); | |
293d984f PT |
529 | dev_kfree_skb_irq(skb); |
530 | skb = nskb; | |
531 | } | |
532 | } | |
533 | ||
534 | ch->ccw[4].count = block_len; | |
535 | if (set_normalized_cda(&ch->ccw[4], skb->data)) { | |
536 | /* | |
537 | * idal allocation failed, try via copying to | |
538 | * trans_skb. trans_skb usually has a pre-allocated | |
539 | * idal. | |
540 | */ | |
541 | if (ctcm_checkalloc_buffer(ch)) { | |
542 | /* | |
543 | * Remove our header. It gets added | |
544 | * again on retransmit. | |
545 | */ | |
63354797 | 546 | refcount_dec(&skb->users); |
293d984f PT |
547 | skb_pull(skb, LL_HEADER_LENGTH + 2); |
548 | ctcm_clear_busy(ch->netdev); | |
aa3f2cb6 | 549 | return -ENOMEM; |
293d984f PT |
550 | } |
551 | ||
552 | skb_reset_tail_pointer(ch->trans_skb); | |
553 | ch->trans_skb->len = 0; | |
554 | ch->ccw[1].count = skb->len; | |
555 | skb_copy_from_linear_data(skb, | |
556 | skb_put(ch->trans_skb, skb->len), skb->len); | |
63354797 | 557 | refcount_dec(&skb->users); |
293d984f PT |
558 | dev_kfree_skb_irq(skb); |
559 | ccw_idx = 0; | |
560 | } else { | |
561 | skb_queue_tail(&ch->io_queue, skb); | |
562 | ccw_idx = 3; | |
563 | } | |
ce1f8938 UB |
564 | if (do_debug_ccw) |
565 | ctcmpc_dumpit((char *)&ch->ccw[ccw_idx], | |
566 | sizeof(struct ccw1) * 3); | |
293d984f PT |
567 | ch->retry = 0; |
568 | fsm_newstate(ch->fsm, CTC_STATE_TX); | |
569 | fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); | |
570 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); | |
ee6edb97 | 571 | ch->prof.send_stamp = jiffies; |
293d984f PT |
572 | rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], |
573 | (unsigned long)ch, 0xff, 0); | |
574 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); | |
575 | if (ccw_idx == 3) | |
576 | ch->prof.doios_single++; | |
577 | if (rc != 0) { | |
578 | fsm_deltimer(&ch->timer); | |
579 | ctcm_ccw_check_rc(ch, rc, "single skb TX"); | |
580 | if (ccw_idx == 3) | |
581 | skb_dequeue_tail(&ch->io_queue); | |
582 | /* | |
583 | * Remove our header. It gets added | |
584 | * again on retransmit. | |
585 | */ | |
586 | skb_pull(skb, LL_HEADER_LENGTH + 2); | |
587 | } else if (ccw_idx == 0) { | |
588 | struct net_device *dev = ch->netdev; | |
261893d3 | 589 | struct ctcm_priv *priv = dev->ml_priv; |
293d984f PT |
590 | priv->stats.tx_packets++; |
591 | priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; | |
592 | } | |
593 | done: | |
594 | ctcm_clear_busy(ch->netdev); | |
595 | return rc; | |
596 | } | |
597 | ||
598 | static void ctcmpc_send_sweep_req(struct channel *rch) | |
599 | { | |
600 | struct net_device *dev = rch->netdev; | |
601 | struct ctcm_priv *priv; | |
602 | struct mpc_group *grp; | |
603 | struct th_sweep *header; | |
604 | struct sk_buff *sweep_skb; | |
605 | struct channel *ch; | |
aa3f2cb6 | 606 | /* int rc = 0; */ |
293d984f | 607 | |
261893d3 | 608 | priv = dev->ml_priv; |
293d984f | 609 | grp = priv->mpcg; |
3c09e264 | 610 | ch = priv->channel[CTCM_WRITE]; |
293d984f | 611 | |
293d984f PT |
612 | /* sweep processing is not complete until response and request */ |
613 | /* has completed for all read channels in group */ | |
614 | if (grp->in_sweep == 0) { | |
615 | grp->in_sweep = 1; | |
3c09e264 UB |
616 | grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ]; |
617 | grp->sweep_req_pend_num = grp->active_channels[CTCM_READ]; | |
293d984f PT |
618 | } |
619 | ||
620 | sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); | |
621 | ||
622 | if (sweep_skb == NULL) { | |
aa3f2cb6 PT |
623 | /* rc = -ENOMEM; */ |
624 | goto nomem; | |
293d984f PT |
625 | } |
626 | ||
627 | header = kmalloc(TH_SWEEP_LENGTH, gfp_type()); | |
628 | ||
629 | if (!header) { | |
630 | dev_kfree_skb_any(sweep_skb); | |
aa3f2cb6 PT |
631 | /* rc = -ENOMEM; */ |
632 | goto nomem; | |
293d984f PT |
633 | } |
634 | ||
635 | header->th.th_seg = 0x00 ; | |
636 | header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */ | |
637 | header->th.th_blk_flag = 0x00; | |
638 | header->th.th_is_xid = 0x00; | |
639 | header->th.th_seq_num = 0x00; | |
640 | header->sw.th_last_seq = ch->th_seq_num; | |
641 | ||
59ae1d12 | 642 | skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH); |
293d984f PT |
643 | |
644 | kfree(header); | |
645 | ||
860e9538 | 646 | netif_trans_update(dev); |
293d984f PT |
647 | skb_queue_tail(&ch->sweep_queue, sweep_skb); |
648 | ||
649 | fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); | |
650 | ||
651 | return; | |
652 | ||
aa3f2cb6 PT |
653 | nomem: |
654 | grp->in_sweep = 0; | |
655 | ctcm_clear_busy(dev); | |
656 | fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); | |
293d984f PT |
657 | |
658 | return; | |
659 | } | |
660 | ||
661 | /* | |
662 | * MPC mode version of transmit_skb | |
663 | */ | |
664 | static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb) | |
665 | { | |
666 | struct pdu *p_header; | |
667 | struct net_device *dev = ch->netdev; | |
261893d3 | 668 | struct ctcm_priv *priv = dev->ml_priv; |
293d984f PT |
669 | struct mpc_group *grp = priv->mpcg; |
670 | struct th_header *header; | |
671 | struct sk_buff *nskb; | |
672 | int rc = 0; | |
673 | int ccw_idx; | |
674 | unsigned long hi; | |
675 | unsigned long saveflags = 0; /* avoids compiler warning */ | |
293d984f | 676 | |
aa3f2cb6 PT |
677 | CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n", |
678 | __func__, dev->name, smp_processor_id(), ch, | |
679 | ch->id, fsm_getstate_str(ch->fsm)); | |
293d984f PT |
680 | |
681 | if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) { | |
682 | spin_lock_irqsave(&ch->collect_lock, saveflags); | |
63354797 | 683 | refcount_inc(&skb->users); |
293d984f PT |
684 | p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); |
685 | ||
686 | if (!p_header) { | |
293d984f | 687 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); |
aa3f2cb6 | 688 | goto nomem_exit; |
293d984f PT |
689 | } |
690 | ||
691 | p_header->pdu_offset = skb->len; | |
692 | p_header->pdu_proto = 0x01; | |
693 | p_header->pdu_flag = 0x00; | |
5cd77c13 | 694 | if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) { |
293d984f PT |
695 | p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; |
696 | } else { | |
697 | p_header->pdu_flag |= PDU_FIRST; | |
698 | } | |
699 | p_header->pdu_seq = 0; | |
700 | memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, | |
701 | PDU_HEADER_LENGTH); | |
702 | ||
aa3f2cb6 PT |
703 | CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n" |
704 | "pdu header and data for up to 32 bytes:\n", | |
705 | __func__, dev->name, skb->len); | |
706 | CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); | |
293d984f PT |
707 | |
708 | skb_queue_tail(&ch->collect_queue, skb); | |
709 | ch->collect_len += skb->len; | |
710 | kfree(p_header); | |
711 | ||
712 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
713 | goto done; | |
714 | } | |
715 | ||
716 | /* | |
717 | * Protect skb against beeing free'd by upper | |
718 | * layers. | |
719 | */ | |
63354797 | 720 | refcount_inc(&skb->users); |
293d984f | 721 | |
293d984f PT |
722 | /* |
723 | * IDAL support in CTCM is broken, so we have to | |
724 | * care about skb's above 2G ourselves. | |
725 | */ | |
726 | hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31; | |
727 | if (hi) { | |
728 | nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); | |
729 | if (!nskb) { | |
aa3f2cb6 | 730 | goto nomem_exit; |
293d984f | 731 | } else { |
59ae1d12 | 732 | skb_put_data(nskb, skb->data, skb->len); |
63354797 RE |
733 | refcount_inc(&nskb->users); |
734 | refcount_dec(&skb->users); | |
293d984f PT |
735 | dev_kfree_skb_irq(skb); |
736 | skb = nskb; | |
737 | } | |
738 | } | |
739 | ||
740 | p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); | |
741 | ||
aa3f2cb6 PT |
742 | if (!p_header) |
743 | goto nomem_exit; | |
293d984f PT |
744 | |
745 | p_header->pdu_offset = skb->len; | |
746 | p_header->pdu_proto = 0x01; | |
747 | p_header->pdu_flag = 0x00; | |
748 | p_header->pdu_seq = 0; | |
5cd77c13 | 749 | if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) { |
293d984f PT |
750 | p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; |
751 | } else { | |
752 | p_header->pdu_flag |= PDU_FIRST; | |
753 | } | |
754 | memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH); | |
755 | ||
756 | kfree(p_header); | |
757 | ||
758 | if (ch->collect_len > 0) { | |
759 | spin_lock_irqsave(&ch->collect_lock, saveflags); | |
760 | skb_queue_tail(&ch->collect_queue, skb); | |
761 | ch->collect_len += skb->len; | |
762 | skb = skb_dequeue(&ch->collect_queue); | |
763 | ch->collect_len -= skb->len; | |
764 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
765 | } | |
766 | ||
767 | p_header = (struct pdu *)skb->data; | |
768 | p_header->pdu_flag |= PDU_LAST; | |
769 | ||
770 | ch->prof.txlen += skb->len - PDU_HEADER_LENGTH; | |
771 | ||
772 | header = kmalloc(TH_HEADER_LENGTH, gfp_type()); | |
aa3f2cb6 PT |
773 | if (!header) |
774 | goto nomem_exit; | |
293d984f PT |
775 | |
776 | header->th_seg = 0x00; | |
777 | header->th_ch_flag = TH_HAS_PDU; /* Normal data */ | |
778 | header->th_blk_flag = 0x00; | |
779 | header->th_is_xid = 0x00; /* Just data here */ | |
780 | ch->th_seq_num++; | |
781 | header->th_seq_num = ch->th_seq_num; | |
782 | ||
aa3f2cb6 PT |
783 | CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" , |
784 | __func__, dev->name, ch->th_seq_num); | |
293d984f PT |
785 | |
786 | /* put the TH on the packet */ | |
787 | memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH); | |
788 | ||
789 | kfree(header); | |
790 | ||
aa3f2cb6 PT |
791 | CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for " |
792 | "up to 32 bytes sent to vtam:\n", | |
793 | __func__, dev->name, skb->len); | |
794 | CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); | |
293d984f PT |
795 | |
796 | ch->ccw[4].count = skb->len; | |
797 | if (set_normalized_cda(&ch->ccw[4], skb->data)) { | |
798 | /* | |
aa3f2cb6 PT |
799 | * idal allocation failed, try via copying to trans_skb. |
800 | * trans_skb usually has a pre-allocated idal. | |
293d984f PT |
801 | */ |
802 | if (ctcm_checkalloc_buffer(ch)) { | |
803 | /* | |
aa3f2cb6 PT |
804 | * Remove our header. |
805 | * It gets added again on retransmit. | |
293d984f | 806 | */ |
aa3f2cb6 | 807 | goto nomem_exit; |
293d984f PT |
808 | } |
809 | ||
810 | skb_reset_tail_pointer(ch->trans_skb); | |
811 | ch->trans_skb->len = 0; | |
812 | ch->ccw[1].count = skb->len; | |
59ae1d12 | 813 | skb_put_data(ch->trans_skb, skb->data, skb->len); |
63354797 | 814 | refcount_dec(&skb->users); |
293d984f PT |
815 | dev_kfree_skb_irq(skb); |
816 | ccw_idx = 0; | |
aa3f2cb6 PT |
817 | CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n" |
818 | "up to 32 bytes sent to vtam:\n", | |
819 | __func__, dev->name, ch->trans_skb->len); | |
820 | CTCM_D3_DUMP((char *)ch->trans_skb->data, | |
821 | min_t(int, 32, ch->trans_skb->len)); | |
293d984f PT |
822 | } else { |
823 | skb_queue_tail(&ch->io_queue, skb); | |
824 | ccw_idx = 3; | |
825 | } | |
826 | ch->retry = 0; | |
827 | fsm_newstate(ch->fsm, CTC_STATE_TX); | |
828 | fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); | |
829 | ||
830 | if (do_debug_ccw) | |
831 | ctcmpc_dumpit((char *)&ch->ccw[ccw_idx], | |
832 | sizeof(struct ccw1) * 3); | |
833 | ||
834 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); | |
ee6edb97 | 835 | ch->prof.send_stamp = jiffies; |
293d984f PT |
836 | rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], |
837 | (unsigned long)ch, 0xff, 0); | |
838 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); | |
839 | if (ccw_idx == 3) | |
840 | ch->prof.doios_single++; | |
841 | if (rc != 0) { | |
842 | fsm_deltimer(&ch->timer); | |
843 | ctcm_ccw_check_rc(ch, rc, "single skb TX"); | |
844 | if (ccw_idx == 3) | |
845 | skb_dequeue_tail(&ch->io_queue); | |
846 | } else if (ccw_idx == 0) { | |
847 | priv->stats.tx_packets++; | |
848 | priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH; | |
849 | } | |
aa3f2cb6 | 850 | if (ch->th_seq_num > 0xf0000000) /* Chose at random. */ |
293d984f PT |
851 | ctcmpc_send_sweep_req(ch); |
852 | ||
aa3f2cb6 PT |
853 | goto done; |
854 | nomem_exit: | |
855 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT, | |
856 | "%s(%s): MEMORY allocation ERROR\n", | |
857 | CTCM_FUNTAIL, ch->id); | |
858 | rc = -ENOMEM; | |
63354797 | 859 | refcount_dec(&skb->users); |
aa3f2cb6 PT |
860 | dev_kfree_skb_any(skb); |
861 | fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); | |
293d984f | 862 | done: |
aa3f2cb6 PT |
863 | CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name); |
864 | return rc; | |
293d984f PT |
865 | } |
866 | ||
867 | /** | |
868 | * Start transmission of a packet. | |
869 | * Called from generic network device layer. | |
870 | * | |
871 | * skb Pointer to buffer containing the packet. | |
872 | * dev Pointer to interface struct. | |
873 | * | |
874 | * returns 0 if packet consumed, !0 if packet rejected. | |
875 | * Note: If we return !0, then the packet is free'd by | |
876 | * the generic network layer. | |
877 | */ | |
878 | /* first merge version - leaving both functions separated */ | |
879 | static int ctcm_tx(struct sk_buff *skb, struct net_device *dev) | |
880 | { | |
261893d3 | 881 | struct ctcm_priv *priv = dev->ml_priv; |
293d984f PT |
882 | |
883 | if (skb == NULL) { | |
aa3f2cb6 PT |
884 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
885 | "%s(%s): NULL sk_buff passed", | |
886 | CTCM_FUNTAIL, dev->name); | |
293d984f | 887 | priv->stats.tx_dropped++; |
6ed10654 | 888 | return NETDEV_TX_OK; |
293d984f PT |
889 | } |
890 | if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) { | |
aa3f2cb6 PT |
891 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
892 | "%s(%s): Got sk_buff with head room < %ld bytes", | |
893 | CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2); | |
293d984f PT |
894 | dev_kfree_skb(skb); |
895 | priv->stats.tx_dropped++; | |
6ed10654 | 896 | return NETDEV_TX_OK; |
293d984f PT |
897 | } |
898 | ||
899 | /* | |
900 | * If channels are not running, try to restart them | |
901 | * and throw away packet. | |
902 | */ | |
903 | if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) { | |
904 | fsm_event(priv->fsm, DEV_EVENT_START, dev); | |
905 | dev_kfree_skb(skb); | |
906 | priv->stats.tx_dropped++; | |
907 | priv->stats.tx_errors++; | |
908 | priv->stats.tx_carrier_errors++; | |
6ed10654 | 909 | return NETDEV_TX_OK; |
293d984f PT |
910 | } |
911 | ||
912 | if (ctcm_test_and_set_busy(dev)) | |
3a05d140 | 913 | return NETDEV_TX_BUSY; |
293d984f | 914 | |
860e9538 | 915 | netif_trans_update(dev); |
3c09e264 | 916 | if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) |
3a05d140 | 917 | return NETDEV_TX_BUSY; |
6ed10654 | 918 | return NETDEV_TX_OK; |
293d984f PT |
919 | } |
920 | ||
921 | /* unmerged MPC variant of ctcm_tx */ | |
922 | static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev) | |
923 | { | |
924 | int len = 0; | |
261893d3 | 925 | struct ctcm_priv *priv = dev->ml_priv; |
aa3f2cb6 | 926 | struct mpc_group *grp = priv->mpcg; |
293d984f PT |
927 | struct sk_buff *newskb = NULL; |
928 | ||
293d984f PT |
929 | /* |
930 | * Some sanity checks ... | |
931 | */ | |
932 | if (skb == NULL) { | |
aa3f2cb6 PT |
933 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
934 | "%s(%s): NULL sk_buff passed", | |
935 | CTCM_FUNTAIL, dev->name); | |
293d984f PT |
936 | priv->stats.tx_dropped++; |
937 | goto done; | |
938 | } | |
939 | if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) { | |
aa3f2cb6 PT |
940 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, |
941 | "%s(%s): Got sk_buff with head room < %ld bytes", | |
942 | CTCM_FUNTAIL, dev->name, | |
943 | TH_HEADER_LENGTH + PDU_HEADER_LENGTH); | |
293d984f | 944 | |
aa3f2cb6 | 945 | CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); |
293d984f PT |
946 | |
947 | len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH; | |
948 | newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA); | |
949 | ||
950 | if (!newskb) { | |
aa3f2cb6 PT |
951 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, |
952 | "%s: %s: __dev_alloc_skb failed", | |
953 | __func__, dev->name); | |
293d984f PT |
954 | |
955 | dev_kfree_skb_any(skb); | |
956 | priv->stats.tx_dropped++; | |
957 | priv->stats.tx_errors++; | |
958 | priv->stats.tx_carrier_errors++; | |
959 | fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); | |
960 | goto done; | |
961 | } | |
962 | newskb->protocol = skb->protocol; | |
963 | skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH); | |
59ae1d12 | 964 | skb_put_data(newskb, skb->data, skb->len); |
293d984f PT |
965 | dev_kfree_skb_any(skb); |
966 | skb = newskb; | |
967 | } | |
968 | ||
969 | /* | |
970 | * If channels are not running, | |
971 | * notify anybody about a link failure and throw | |
972 | * away packet. | |
973 | */ | |
974 | if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) || | |
975 | (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { | |
976 | dev_kfree_skb_any(skb); | |
aa3f2cb6 PT |
977 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
978 | "%s(%s): inactive MPCGROUP - dropped", | |
979 | CTCM_FUNTAIL, dev->name); | |
293d984f PT |
980 | priv->stats.tx_dropped++; |
981 | priv->stats.tx_errors++; | |
982 | priv->stats.tx_carrier_errors++; | |
983 | goto done; | |
984 | } | |
985 | ||
986 | if (ctcm_test_and_set_busy(dev)) { | |
aa3f2cb6 PT |
987 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
988 | "%s(%s): device busy - dropped", | |
989 | CTCM_FUNTAIL, dev->name); | |
293d984f PT |
990 | dev_kfree_skb_any(skb); |
991 | priv->stats.tx_dropped++; | |
992 | priv->stats.tx_errors++; | |
993 | priv->stats.tx_carrier_errors++; | |
994 | fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); | |
995 | goto done; | |
996 | } | |
997 | ||
860e9538 | 998 | netif_trans_update(dev); |
3c09e264 | 999 | if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) { |
aa3f2cb6 PT |
1000 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
1001 | "%s(%s): device error - dropped", | |
1002 | CTCM_FUNTAIL, dev->name); | |
293d984f PT |
1003 | dev_kfree_skb_any(skb); |
1004 | priv->stats.tx_dropped++; | |
1005 | priv->stats.tx_errors++; | |
1006 | priv->stats.tx_carrier_errors++; | |
1007 | ctcm_clear_busy(dev); | |
1008 | fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); | |
1009 | goto done; | |
1010 | } | |
1011 | ctcm_clear_busy(dev); | |
1012 | done: | |
1013 | if (do_debug) | |
1014 | MPC_DBF_DEV_NAME(TRACE, dev, "exit"); | |
1015 | ||
6ed10654 | 1016 | return NETDEV_TX_OK; /* handle freeing of skb here */ |
293d984f PT |
1017 | } |
1018 | ||
1019 | ||
1020 | /** | |
1021 | * Sets MTU of an interface. | |
1022 | * | |
1023 | * dev Pointer to interface struct. | |
1024 | * new_mtu The new MTU to use for this interface. | |
1025 | * | |
1026 | * returns 0 on success, -EINVAL if MTU is out of valid range. | |
1027 | * (valid range is 576 .. 65527). If VM is on the | |
1028 | * remote side, maximum MTU is 32760, however this is | |
1029 | * not checked here. | |
1030 | */ | |
1031 | static int ctcm_change_mtu(struct net_device *dev, int new_mtu) | |
1032 | { | |
1033 | struct ctcm_priv *priv; | |
1034 | int max_bufsize; | |
1035 | ||
261893d3 | 1036 | priv = dev->ml_priv; |
3c09e264 | 1037 | max_bufsize = priv->channel[CTCM_READ]->max_bufsize; |
293d984f PT |
1038 | |
1039 | if (IS_MPC(priv)) { | |
1040 | if (new_mtu > max_bufsize - TH_HEADER_LENGTH) | |
1041 | return -EINVAL; | |
1042 | dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; | |
1043 | } else { | |
1044 | if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2) | |
1045 | return -EINVAL; | |
1046 | dev->hard_header_len = LL_HEADER_LENGTH + 2; | |
1047 | } | |
1048 | dev->mtu = new_mtu; | |
1049 | return 0; | |
1050 | } | |
1051 | ||
1052 | /** | |
1053 | * Returns interface statistics of a device. | |
1054 | * | |
1055 | * dev Pointer to interface struct. | |
1056 | * | |
1057 | * returns Pointer to stats struct of this interface. | |
1058 | */ | |
1059 | static struct net_device_stats *ctcm_stats(struct net_device *dev) | |
1060 | { | |
261893d3 | 1061 | return &((struct ctcm_priv *)dev->ml_priv)->stats; |
293d984f PT |
1062 | } |
1063 | ||
293d984f PT |
1064 | static void ctcm_free_netdevice(struct net_device *dev) |
1065 | { | |
1066 | struct ctcm_priv *priv; | |
1067 | struct mpc_group *grp; | |
1068 | ||
aa3f2cb6 PT |
1069 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, |
1070 | "%s(%s)", CTCM_FUNTAIL, dev->name); | |
261893d3 | 1071 | priv = dev->ml_priv; |
293d984f PT |
1072 | if (priv) { |
1073 | grp = priv->mpcg; | |
1074 | if (grp) { | |
1075 | if (grp->fsm) | |
1076 | kfree_fsm(grp->fsm); | |
1077 | if (grp->xid_skb) | |
1078 | dev_kfree_skb(grp->xid_skb); | |
1079 | if (grp->rcvd_xid_skb) | |
1080 | dev_kfree_skb(grp->rcvd_xid_skb); | |
1081 | tasklet_kill(&grp->mpc_tasklet2); | |
1082 | kfree(grp); | |
1083 | priv->mpcg = NULL; | |
1084 | } | |
1085 | if (priv->fsm) { | |
1086 | kfree_fsm(priv->fsm); | |
1087 | priv->fsm = NULL; | |
1088 | } | |
1089 | kfree(priv->xid); | |
1090 | priv->xid = NULL; | |
1091 | /* | |
1092 | * Note: kfree(priv); is done in "opposite" function of | |
1093 | * allocator function probe_device which is remove_device. | |
1094 | */ | |
1095 | } | |
1096 | #ifdef MODULE | |
1097 | free_netdev(dev); | |
1098 | #endif | |
1099 | } | |
1100 | ||
1101 | struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv); | |
1102 | ||
69b3aa60 FB |
1103 | static const struct net_device_ops ctcm_netdev_ops = { |
1104 | .ndo_open = ctcm_open, | |
1105 | .ndo_stop = ctcm_close, | |
1106 | .ndo_get_stats = ctcm_stats, | |
1107 | .ndo_change_mtu = ctcm_change_mtu, | |
1108 | .ndo_start_xmit = ctcm_tx, | |
1109 | }; | |
1110 | ||
1111 | static const struct net_device_ops ctcm_mpc_netdev_ops = { | |
1112 | .ndo_open = ctcm_open, | |
1113 | .ndo_stop = ctcm_close, | |
1114 | .ndo_get_stats = ctcm_stats, | |
1115 | .ndo_change_mtu = ctcm_change_mtu, | |
1116 | .ndo_start_xmit = ctcmpc_tx, | |
1117 | }; | |
1118 | ||
e0710e51 | 1119 | static void ctcm_dev_setup(struct net_device *dev) |
293d984f | 1120 | { |
293d984f PT |
1121 | dev->type = ARPHRD_SLIP; |
1122 | dev->tx_queue_len = 100; | |
1123 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; | |
46b3ef4c JW |
1124 | dev->min_mtu = 576; |
1125 | dev->max_mtu = 65527; | |
293d984f PT |
1126 | } |
1127 | ||
1128 | /* | |
1129 | * Initialize everything of the net device except the name and the | |
1130 | * channel structs. | |
1131 | */ | |
1132 | static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv) | |
1133 | { | |
1134 | struct net_device *dev; | |
1135 | struct mpc_group *grp; | |
1136 | if (!priv) | |
1137 | return NULL; | |
1138 | ||
1139 | if (IS_MPC(priv)) | |
c835a677 TG |
1140 | dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN, |
1141 | ctcm_dev_setup); | |
293d984f | 1142 | else |
c835a677 TG |
1143 | dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN, |
1144 | ctcm_dev_setup); | |
293d984f PT |
1145 | |
1146 | if (!dev) { | |
aa3f2cb6 PT |
1147 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT, |
1148 | "%s: MEMORY allocation ERROR", | |
1149 | CTCM_FUNTAIL); | |
293d984f PT |
1150 | return NULL; |
1151 | } | |
261893d3 | 1152 | dev->ml_priv = priv; |
293d984f PT |
1153 | priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names, |
1154 | CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS, | |
1155 | dev_fsm, dev_fsm_len, GFP_KERNEL); | |
1156 | if (priv->fsm == NULL) { | |
1157 | CTCMY_DBF_DEV(SETUP, dev, "init_fsm error"); | |
bc68580d | 1158 | free_netdev(dev); |
293d984f PT |
1159 | return NULL; |
1160 | } | |
1161 | fsm_newstate(priv->fsm, DEV_STATE_STOPPED); | |
1162 | fsm_settimer(priv->fsm, &priv->restart_timer); | |
1163 | ||
1164 | if (IS_MPC(priv)) { | |
1165 | /* MPC Group Initializations */ | |
1166 | grp = ctcmpc_init_mpc_group(priv); | |
1167 | if (grp == NULL) { | |
1168 | MPC_DBF_DEV(SETUP, dev, "init_mpc_group error"); | |
bc68580d | 1169 | free_netdev(dev); |
293d984f PT |
1170 | return NULL; |
1171 | } | |
1172 | tasklet_init(&grp->mpc_tasklet2, | |
1173 | mpc_group_ready, (unsigned long)dev); | |
1174 | dev->mtu = MPC_BUFSIZE_DEFAULT - | |
1175 | TH_HEADER_LENGTH - PDU_HEADER_LENGTH; | |
1176 | ||
69b3aa60 | 1177 | dev->netdev_ops = &ctcm_mpc_netdev_ops; |
293d984f PT |
1178 | dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; |
1179 | priv->buffer_size = MPC_BUFSIZE_DEFAULT; | |
1180 | } else { | |
1181 | dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2; | |
69b3aa60 | 1182 | dev->netdev_ops = &ctcm_netdev_ops; |
293d984f PT |
1183 | dev->hard_header_len = LL_HEADER_LENGTH + 2; |
1184 | } | |
1185 | ||
1186 | CTCMY_DBF_DEV(SETUP, dev, "finished"); | |
aa3f2cb6 | 1187 | |
293d984f PT |
1188 | return dev; |
1189 | } | |
1190 | ||
1191 | /** | |
1192 | * Main IRQ handler. | |
1193 | * | |
1194 | * cdev The ccw_device the interrupt is for. | |
1195 | * intparm interruption parameter. | |
1196 | * irb interruption response block. | |
1197 | */ | |
1198 | static void ctcm_irq_handler(struct ccw_device *cdev, | |
1199 | unsigned long intparm, struct irb *irb) | |
1200 | { | |
1201 | struct channel *ch; | |
1202 | struct net_device *dev; | |
1203 | struct ctcm_priv *priv; | |
1204 | struct ccwgroup_device *cgdev; | |
aa3f2cb6 PT |
1205 | int cstat; |
1206 | int dstat; | |
1207 | ||
1208 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, | |
2a0217d5 | 1209 | "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev)); |
293d984f | 1210 | |
293d984f PT |
1211 | if (ctcm_check_irb_error(cdev, irb)) |
1212 | return; | |
1213 | ||
1214 | cgdev = dev_get_drvdata(&cdev->dev); | |
1215 | ||
aa3f2cb6 PT |
1216 | cstat = irb->scsw.cmd.cstat; |
1217 | dstat = irb->scsw.cmd.dstat; | |
1218 | ||
293d984f PT |
1219 | /* Check for unsolicited interrupts. */ |
1220 | if (cgdev == NULL) { | |
2a7c6f2c PT |
1221 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR, |
1222 | "%s(%s) unsolicited irq: c-%02x d-%02x\n", | |
1223 | CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat); | |
1224 | dev_warn(&cdev->dev, | |
1225 | "The adapter received a non-specific IRQ\n"); | |
293d984f PT |
1226 | return; |
1227 | } | |
1228 | ||
1229 | priv = dev_get_drvdata(&cgdev->dev); | |
1230 | ||
1231 | /* Try to extract channel from driver data. */ | |
3c09e264 UB |
1232 | if (priv->channel[CTCM_READ]->cdev == cdev) |
1233 | ch = priv->channel[CTCM_READ]; | |
1234 | else if (priv->channel[CTCM_WRITE]->cdev == cdev) | |
1235 | ch = priv->channel[CTCM_WRITE]; | |
293d984f | 1236 | else { |
2a7c6f2c PT |
1237 | dev_err(&cdev->dev, |
1238 | "%s: Internal error: Can't determine channel for " | |
1239 | "interrupt device %s\n", | |
1240 | __func__, dev_name(&cdev->dev)); | |
1241 | /* Explain: inconsistent internal structures */ | |
293d984f PT |
1242 | return; |
1243 | } | |
1244 | ||
aa3f2cb6 | 1245 | dev = ch->netdev; |
293d984f | 1246 | if (dev == NULL) { |
2a7c6f2c PT |
1247 | dev_err(&cdev->dev, |
1248 | "%s Internal error: net_device is NULL, ch = 0x%p\n", | |
1249 | __func__, ch); | |
1250 | /* Explain: inconsistent internal structures */ | |
293d984f PT |
1251 | return; |
1252 | } | |
1253 | ||
293d984f PT |
1254 | /* Copy interruption response block. */ |
1255 | memcpy(ch->irb, irb, sizeof(struct irb)); | |
1256 | ||
2a7c6f2c | 1257 | /* Issue error message and return on subchannel error code */ |
23d805b6 | 1258 | if (irb->scsw.cmd.cstat) { |
293d984f | 1259 | fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch); |
2a7c6f2c PT |
1260 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, |
1261 | "%s(%s): sub-ch check %s: cs=%02x ds=%02x", | |
1262 | CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat); | |
1263 | dev_warn(&cdev->dev, | |
1264 | "A check occurred on the subchannel\n"); | |
293d984f PT |
1265 | return; |
1266 | } | |
1267 | ||
1268 | /* Check the reason-code of a unit check */ | |
23d805b6 | 1269 | if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) { |
aa3f2cb6 PT |
1270 | if ((irb->ecw[0] & ch->sense_rc) == 0) |
1271 | /* print it only once */ | |
2a7c6f2c | 1272 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, |
aa3f2cb6 PT |
1273 | "%s(%s): sense=%02x, ds=%02x", |
1274 | CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat); | |
293d984f PT |
1275 | ccw_unit_check(ch, irb->ecw[0]); |
1276 | return; | |
1277 | } | |
23d805b6 PO |
1278 | if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) { |
1279 | if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) | |
293d984f PT |
1280 | fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch); |
1281 | else | |
1282 | fsm_event(ch->fsm, CTC_EVENT_BUSY, ch); | |
1283 | return; | |
1284 | } | |
23d805b6 | 1285 | if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { |
293d984f PT |
1286 | fsm_event(ch->fsm, CTC_EVENT_ATTN, ch); |
1287 | return; | |
1288 | } | |
23d805b6 PO |
1289 | if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) || |
1290 | (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) || | |
1291 | (irb->scsw.cmd.stctl == | |
293d984f PT |
1292 | (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) |
1293 | fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch); | |
1294 | else | |
1295 | fsm_event(ch->fsm, CTC_EVENT_IRQ, ch); | |
1296 | ||
1297 | } | |
1298 | ||
20cdffa4 SO |
1299 | static const struct device_type ctcm_devtype = { |
1300 | .name = "ctcm", | |
1301 | .groups = ctcm_attr_groups, | |
1302 | }; | |
1303 | ||
293d984f PT |
1304 | /** |
1305 | * Add ctcm specific attributes. | |
1306 | * Add ctcm private data. | |
1307 | * | |
1308 | * cgdev pointer to ccwgroup_device just added | |
1309 | * | |
1310 | * returns 0 on success, !0 on failure. | |
1311 | */ | |
1312 | static int ctcm_probe_device(struct ccwgroup_device *cgdev) | |
1313 | { | |
1314 | struct ctcm_priv *priv; | |
293d984f | 1315 | |
aa3f2cb6 PT |
1316 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, |
1317 | "%s %p", | |
1318 | __func__, cgdev); | |
293d984f PT |
1319 | |
1320 | if (!get_device(&cgdev->dev)) | |
1321 | return -ENODEV; | |
1322 | ||
1323 | priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL); | |
1324 | if (!priv) { | |
aa3f2cb6 PT |
1325 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
1326 | "%s: memory allocation failure", | |
1327 | CTCM_FUNTAIL); | |
293d984f PT |
1328 | put_device(&cgdev->dev); |
1329 | return -ENOMEM; | |
1330 | } | |
293d984f PT |
1331 | priv->buffer_size = CTCM_BUFSIZE_DEFAULT; |
1332 | cgdev->cdev[0]->handler = ctcm_irq_handler; | |
1333 | cgdev->cdev[1]->handler = ctcm_irq_handler; | |
1334 | dev_set_drvdata(&cgdev->dev, priv); | |
20cdffa4 | 1335 | cgdev->dev.type = &ctcm_devtype; |
293d984f PT |
1336 | |
1337 | return 0; | |
1338 | } | |
1339 | ||
1340 | /** | |
1341 | * Add a new channel to the list of channels. | |
1342 | * Keeps the channel list sorted. | |
1343 | * | |
1344 | * cdev The ccw_device to be added. | |
1345 | * type The type class of the new channel. | |
1346 | * priv Points to the private data of the ccwgroup_device. | |
1347 | * | |
1348 | * returns 0 on success, !0 on error. | |
1349 | */ | |
0ca8cc6f | 1350 | static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type, |
293d984f PT |
1351 | struct ctcm_priv *priv) |
1352 | { | |
1353 | struct channel **c = &channels; | |
1354 | struct channel *ch; | |
1355 | int ccw_num; | |
1356 | int rc = 0; | |
1357 | ||
aa3f2cb6 PT |
1358 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, |
1359 | "%s(%s), type %d, proto %d", | |
2a0217d5 | 1360 | __func__, dev_name(&cdev->dev), type, priv->protocol); |
aa3f2cb6 | 1361 | |
293d984f PT |
1362 | ch = kzalloc(sizeof(struct channel), GFP_KERNEL); |
1363 | if (ch == NULL) | |
aa3f2cb6 | 1364 | return -ENOMEM; |
293d984f PT |
1365 | |
1366 | ch->protocol = priv->protocol; | |
1367 | if (IS_MPC(priv)) { | |
ae57b20a | 1368 | ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type()); |
293d984f PT |
1369 | if (ch->discontact_th == NULL) |
1370 | goto nomem_return; | |
1371 | ||
1372 | ch->discontact_th->th_blk_flag = TH_DISCONTACT; | |
1373 | tasklet_init(&ch->ch_disc_tasklet, | |
1374 | mpc_action_send_discontact, (unsigned long)ch); | |
1375 | ||
1376 | tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch); | |
1377 | ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35); | |
1378 | ccw_num = 17; | |
1379 | } else | |
1380 | ccw_num = 8; | |
1381 | ||
6396bb22 | 1382 | ch->ccw = kcalloc(ccw_num, sizeof(struct ccw1), GFP_KERNEL | GFP_DMA); |
293d984f PT |
1383 | if (ch->ccw == NULL) |
1384 | goto nomem_return; | |
1385 | ||
1386 | ch->cdev = cdev; | |
2a0217d5 | 1387 | snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev)); |
293d984f PT |
1388 | ch->type = type; |
1389 | ||
1390 | /** | |
1391 | * "static" ccws are used in the following way: | |
1392 | * | |
1393 | * ccw[0..2] (Channel program for generic I/O): | |
1394 | * 0: prepare | |
1395 | * 1: read or write (depending on direction) with fixed | |
1396 | * buffer (idal allocated once when buffer is allocated) | |
1397 | * 2: nop | |
1398 | * ccw[3..5] (Channel program for direct write of packets) | |
1399 | * 3: prepare | |
1400 | * 4: write (idal allocated on every write). | |
1401 | * 5: nop | |
1402 | * ccw[6..7] (Channel program for initial channel setup): | |
1403 | * 6: set extended mode | |
1404 | * 7: nop | |
1405 | * | |
1406 | * ch->ccw[0..5] are initialized in ch_action_start because | |
1407 | * the channel's direction is yet unknown here. | |
1408 | * | |
1409 | * ccws used for xid2 negotiations | |
1410 | * ch-ccw[8-14] need to be used for the XID exchange either | |
1411 | * X side XID2 Processing | |
1412 | * 8: write control | |
1413 | * 9: write th | |
1414 | * 10: write XID | |
1415 | * 11: read th from secondary | |
1416 | * 12: read XID from secondary | |
1417 | * 13: read 4 byte ID | |
1418 | * 14: nop | |
1419 | * Y side XID Processing | |
1420 | * 8: sense | |
1421 | * 9: read th | |
1422 | * 10: read XID | |
1423 | * 11: write th | |
1424 | * 12: write XID | |
1425 | * 13: write 4 byte ID | |
1426 | * 14: nop | |
1427 | * | |
1428 | * ccws used for double noop due to VM timing issues | |
1429 | * which result in unrecoverable Busy on channel | |
1430 | * 15: nop | |
1431 | * 16: nop | |
1432 | */ | |
1433 | ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED; | |
1434 | ch->ccw[6].flags = CCW_FLAG_SLI; | |
1435 | ||
1436 | ch->ccw[7].cmd_code = CCW_CMD_NOOP; | |
1437 | ch->ccw[7].flags = CCW_FLAG_SLI; | |
1438 | ||
1439 | if (IS_MPC(priv)) { | |
1440 | ch->ccw[15].cmd_code = CCW_CMD_WRITE; | |
1441 | ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC; | |
1442 | ch->ccw[15].count = TH_HEADER_LENGTH; | |
1443 | ch->ccw[15].cda = virt_to_phys(ch->discontact_th); | |
1444 | ||
1445 | ch->ccw[16].cmd_code = CCW_CMD_NOOP; | |
1446 | ch->ccw[16].flags = CCW_FLAG_SLI; | |
1447 | ||
1448 | ch->fsm = init_fsm(ch->id, ctc_ch_state_names, | |
1449 | ctc_ch_event_names, CTC_MPC_NR_STATES, | |
1450 | CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm, | |
1451 | mpc_ch_fsm_len, GFP_KERNEL); | |
1452 | } else { | |
1453 | ch->fsm = init_fsm(ch->id, ctc_ch_state_names, | |
1454 | ctc_ch_event_names, CTC_NR_STATES, | |
1455 | CTC_NR_EVENTS, ch_fsm, | |
1456 | ch_fsm_len, GFP_KERNEL); | |
1457 | } | |
1458 | if (ch->fsm == NULL) | |
b8f37a4a | 1459 | goto nomem_return; |
293d984f PT |
1460 | |
1461 | fsm_newstate(ch->fsm, CTC_STATE_IDLE); | |
1462 | ||
1463 | ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL); | |
1464 | if (ch->irb == NULL) | |
1465 | goto nomem_return; | |
1466 | ||
1467 | while (*c && ctcm_less_than((*c)->id, ch->id)) | |
1468 | c = &(*c)->next; | |
1469 | ||
1470 | if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) { | |
1471 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, | |
1472 | "%s (%s) already in list, using old entry", | |
aa3f2cb6 | 1473 | __func__, (*c)->id); |
293d984f PT |
1474 | |
1475 | goto free_return; | |
1476 | } | |
1477 | ||
1478 | spin_lock_init(&ch->collect_lock); | |
1479 | ||
1480 | fsm_settimer(ch->fsm, &ch->timer); | |
1481 | skb_queue_head_init(&ch->io_queue); | |
1482 | skb_queue_head_init(&ch->collect_queue); | |
1483 | ||
1484 | if (IS_MPC(priv)) { | |
1485 | fsm_settimer(ch->fsm, &ch->sweep_timer); | |
1486 | skb_queue_head_init(&ch->sweep_queue); | |
1487 | } | |
1488 | ch->next = *c; | |
1489 | *c = ch; | |
1490 | return 0; | |
1491 | ||
1492 | nomem_return: | |
293d984f PT |
1493 | rc = -ENOMEM; |
1494 | ||
1495 | free_return: /* note that all channel pointers are 0 or valid */ | |
aa3f2cb6 | 1496 | kfree(ch->ccw); |
293d984f PT |
1497 | kfree(ch->discontact_th); |
1498 | kfree_fsm(ch->fsm); | |
1499 | kfree(ch->irb); | |
1500 | kfree(ch); | |
1501 | return rc; | |
1502 | } | |
1503 | ||
1504 | /* | |
1505 | * Return type of a detected device. | |
1506 | */ | |
0ca8cc6f | 1507 | static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id) |
293d984f | 1508 | { |
0ca8cc6f UB |
1509 | enum ctcm_channel_types type; |
1510 | type = (enum ctcm_channel_types)id->driver_info; | |
293d984f | 1511 | |
0ca8cc6f UB |
1512 | if (type == ctcm_channel_type_ficon) |
1513 | type = ctcm_channel_type_escon; | |
293d984f PT |
1514 | |
1515 | return type; | |
1516 | } | |
1517 | ||
1518 | /** | |
1519 | * | |
1520 | * Setup an interface. | |
1521 | * | |
1522 | * cgdev Device to be setup. | |
1523 | * | |
1524 | * returns 0 on success, !0 on failure. | |
1525 | */ | |
1526 | static int ctcm_new_device(struct ccwgroup_device *cgdev) | |
1527 | { | |
1528 | char read_id[CTCM_ID_SIZE]; | |
1529 | char write_id[CTCM_ID_SIZE]; | |
1530 | int direction; | |
0ca8cc6f | 1531 | enum ctcm_channel_types type; |
293d984f PT |
1532 | struct ctcm_priv *priv; |
1533 | struct net_device *dev; | |
aa3f2cb6 PT |
1534 | struct ccw_device *cdev0; |
1535 | struct ccw_device *cdev1; | |
a1c1f5ea EL |
1536 | struct channel *readc; |
1537 | struct channel *writec; | |
293d984f | 1538 | int ret; |
a1c1f5ea | 1539 | int result; |
293d984f | 1540 | |
293d984f | 1541 | priv = dev_get_drvdata(&cgdev->dev); |
a1c1f5ea EL |
1542 | if (!priv) { |
1543 | result = -ENODEV; | |
1544 | goto out_err_result; | |
1545 | } | |
293d984f | 1546 | |
aa3f2cb6 PT |
1547 | cdev0 = cgdev->cdev[0]; |
1548 | cdev1 = cgdev->cdev[1]; | |
1549 | ||
1550 | type = get_channel_type(&cdev0->id); | |
293d984f | 1551 | |
b9d3aed7 CH |
1552 | snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev)); |
1553 | snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev)); | |
293d984f | 1554 | |
aa3f2cb6 | 1555 | ret = add_channel(cdev0, type, priv); |
a1c1f5ea EL |
1556 | if (ret) { |
1557 | result = ret; | |
1558 | goto out_err_result; | |
1559 | } | |
aa3f2cb6 | 1560 | ret = add_channel(cdev1, type, priv); |
a1c1f5ea EL |
1561 | if (ret) { |
1562 | result = ret; | |
1563 | goto out_remove_channel1; | |
1564 | } | |
293d984f | 1565 | |
aa3f2cb6 | 1566 | ret = ccw_device_set_online(cdev0); |
293d984f | 1567 | if (ret != 0) { |
aa3f2cb6 PT |
1568 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, |
1569 | "%s(%s) set_online rc=%d", | |
1570 | CTCM_FUNTAIL, read_id, ret); | |
a1c1f5ea EL |
1571 | result = -EIO; |
1572 | goto out_remove_channel2; | |
293d984f PT |
1573 | } |
1574 | ||
aa3f2cb6 | 1575 | ret = ccw_device_set_online(cdev1); |
293d984f | 1576 | if (ret != 0) { |
aa3f2cb6 PT |
1577 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, |
1578 | "%s(%s) set_online rc=%d", | |
1579 | CTCM_FUNTAIL, write_id, ret); | |
a1c1f5ea EL |
1580 | |
1581 | result = -EIO; | |
1582 | goto out_ccw1; | |
293d984f PT |
1583 | } |
1584 | ||
1585 | dev = ctcm_init_netdevice(priv); | |
a1c1f5ea EL |
1586 | if (dev == NULL) { |
1587 | result = -ENODEV; | |
1588 | goto out_ccw2; | |
1589 | } | |
293d984f | 1590 | |
3c09e264 | 1591 | for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { |
293d984f | 1592 | priv->channel[direction] = |
3c09e264 UB |
1593 | channel_get(type, direction == CTCM_READ ? |
1594 | read_id : write_id, direction); | |
293d984f | 1595 | if (priv->channel[direction] == NULL) { |
3c09e264 UB |
1596 | if (direction == CTCM_WRITE) |
1597 | channel_free(priv->channel[CTCM_READ]); | |
27b141fc | 1598 | result = -ENODEV; |
aa3f2cb6 | 1599 | goto out_dev; |
293d984f PT |
1600 | } |
1601 | priv->channel[direction]->netdev = dev; | |
1602 | priv->channel[direction]->protocol = priv->protocol; | |
1603 | priv->channel[direction]->max_bufsize = priv->buffer_size; | |
1604 | } | |
1605 | /* sysfs magic */ | |
1606 | SET_NETDEV_DEV(dev, &cgdev->dev); | |
1607 | ||
a1c1f5ea EL |
1608 | if (register_netdev(dev)) { |
1609 | result = -ENODEV; | |
1610 | goto out_dev; | |
1611 | } | |
293d984f | 1612 | |
293d984f PT |
1613 | strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name)); |
1614 | ||
2a7c6f2c PT |
1615 | dev_info(&dev->dev, |
1616 | "setup OK : r/w = %s/%s, protocol : %d\n", | |
3c09e264 UB |
1617 | priv->channel[CTCM_READ]->id, |
1618 | priv->channel[CTCM_WRITE]->id, priv->protocol); | |
2a7c6f2c | 1619 | |
293d984f | 1620 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, |
aa3f2cb6 | 1621 | "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name, |
3c09e264 UB |
1622 | priv->channel[CTCM_READ]->id, |
1623 | priv->channel[CTCM_WRITE]->id, priv->protocol); | |
293d984f PT |
1624 | |
1625 | return 0; | |
aa3f2cb6 PT |
1626 | out_dev: |
1627 | ctcm_free_netdevice(dev); | |
a1c1f5ea | 1628 | out_ccw2: |
293d984f | 1629 | ccw_device_set_offline(cgdev->cdev[1]); |
a1c1f5ea | 1630 | out_ccw1: |
293d984f | 1631 | ccw_device_set_offline(cgdev->cdev[0]); |
a1c1f5ea | 1632 | out_remove_channel2: |
3c09e264 | 1633 | readc = channel_get(type, read_id, CTCM_READ); |
a1c1f5ea EL |
1634 | channel_remove(readc); |
1635 | out_remove_channel1: | |
3c09e264 | 1636 | writec = channel_get(type, write_id, CTCM_WRITE); |
a1c1f5ea EL |
1637 | channel_remove(writec); |
1638 | out_err_result: | |
1639 | return result; | |
293d984f PT |
1640 | } |
1641 | ||
1642 | /** | |
1643 | * Shutdown an interface. | |
1644 | * | |
1645 | * cgdev Device to be shut down. | |
1646 | * | |
1647 | * returns 0 on success, !0 on failure. | |
1648 | */ | |
1649 | static int ctcm_shutdown_device(struct ccwgroup_device *cgdev) | |
1650 | { | |
1651 | struct ctcm_priv *priv; | |
1652 | struct net_device *dev; | |
1653 | ||
1654 | priv = dev_get_drvdata(&cgdev->dev); | |
1655 | if (!priv) | |
1656 | return -ENODEV; | |
1657 | ||
3c09e264 UB |
1658 | if (priv->channel[CTCM_READ]) { |
1659 | dev = priv->channel[CTCM_READ]->netdev; | |
293d984f PT |
1660 | CTCM_DBF_DEV(SETUP, dev, ""); |
1661 | /* Close the device */ | |
1662 | ctcm_close(dev); | |
1663 | dev->flags &= ~IFF_RUNNING; | |
3c09e264 | 1664 | channel_free(priv->channel[CTCM_READ]); |
293d984f PT |
1665 | } else |
1666 | dev = NULL; | |
1667 | ||
3c09e264 UB |
1668 | if (priv->channel[CTCM_WRITE]) |
1669 | channel_free(priv->channel[CTCM_WRITE]); | |
293d984f PT |
1670 | |
1671 | if (dev) { | |
aa3f2cb6 | 1672 | unregister_netdev(dev); |
293d984f PT |
1673 | ctcm_free_netdevice(dev); |
1674 | } | |
1675 | ||
1676 | if (priv->fsm) | |
1677 | kfree_fsm(priv->fsm); | |
1678 | ||
1679 | ccw_device_set_offline(cgdev->cdev[1]); | |
1680 | ccw_device_set_offline(cgdev->cdev[0]); | |
e043046a ME |
1681 | channel_remove(priv->channel[CTCM_READ]); |
1682 | channel_remove(priv->channel[CTCM_WRITE]); | |
3c09e264 | 1683 | priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL; |
293d984f PT |
1684 | |
1685 | return 0; | |
1686 | ||
1687 | } | |
1688 | ||
1689 | ||
1690 | static void ctcm_remove_device(struct ccwgroup_device *cgdev) | |
1691 | { | |
aa3f2cb6 | 1692 | struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev); |
293d984f | 1693 | |
aa3f2cb6 | 1694 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, |
8ac6d452 UB |
1695 | "removing device %p, proto : %d", |
1696 | cgdev, priv->protocol); | |
293d984f | 1697 | |
293d984f PT |
1698 | if (cgdev->state == CCWGROUP_ONLINE) |
1699 | ctcm_shutdown_device(cgdev); | |
293d984f PT |
1700 | dev_set_drvdata(&cgdev->dev, NULL); |
1701 | kfree(priv); | |
1702 | put_device(&cgdev->dev); | |
1703 | } | |
1704 | ||
b8a2d42a FB |
1705 | static int ctcm_pm_suspend(struct ccwgroup_device *gdev) |
1706 | { | |
1707 | struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev); | |
1708 | ||
1709 | if (gdev->state == CCWGROUP_OFFLINE) | |
1710 | return 0; | |
3c09e264 UB |
1711 | netif_device_detach(priv->channel[CTCM_READ]->netdev); |
1712 | ctcm_close(priv->channel[CTCM_READ]->netdev); | |
1e1815be FB |
1713 | if (!wait_event_timeout(priv->fsm->wait_q, |
1714 | fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) { | |
3c09e264 | 1715 | netif_device_attach(priv->channel[CTCM_READ]->netdev); |
1e1815be FB |
1716 | return -EBUSY; |
1717 | } | |
b8a2d42a FB |
1718 | ccw_device_set_offline(gdev->cdev[1]); |
1719 | ccw_device_set_offline(gdev->cdev[0]); | |
1720 | return 0; | |
1721 | } | |
1722 | ||
1723 | static int ctcm_pm_resume(struct ccwgroup_device *gdev) | |
1724 | { | |
1725 | struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev); | |
1726 | int rc; | |
1727 | ||
1728 | if (gdev->state == CCWGROUP_OFFLINE) | |
1729 | return 0; | |
1730 | rc = ccw_device_set_online(gdev->cdev[1]); | |
1731 | if (rc) | |
1732 | goto err_out; | |
1733 | rc = ccw_device_set_online(gdev->cdev[0]); | |
1734 | if (rc) | |
1735 | goto err_out; | |
3c09e264 | 1736 | ctcm_open(priv->channel[CTCM_READ]->netdev); |
b8a2d42a | 1737 | err_out: |
3c09e264 | 1738 | netif_device_attach(priv->channel[CTCM_READ]->netdev); |
b8a2d42a FB |
1739 | return rc; |
1740 | } | |
1741 | ||
0ca8cc6f UB |
1742 | static struct ccw_device_id ctcm_ids[] = { |
1743 | {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel}, | |
1744 | {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon}, | |
1745 | {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon}, | |
1746 | {}, | |
1747 | }; | |
1748 | MODULE_DEVICE_TABLE(ccw, ctcm_ids); | |
1749 | ||
1750 | static struct ccw_driver ctcm_ccw_driver = { | |
3bda058b SO |
1751 | .driver = { |
1752 | .owner = THIS_MODULE, | |
1753 | .name = "ctcm", | |
1754 | }, | |
0ca8cc6f UB |
1755 | .ids = ctcm_ids, |
1756 | .probe = ccwgroup_probe_ccwdev, | |
1757 | .remove = ccwgroup_remove_ccwdev, | |
420f42ec | 1758 | .int_class = IRQIO_CTC, |
0ca8cc6f UB |
1759 | }; |
1760 | ||
293d984f | 1761 | static struct ccwgroup_driver ctcm_group_driver = { |
3c190c51 SO |
1762 | .driver = { |
1763 | .owner = THIS_MODULE, | |
1764 | .name = CTC_DRIVER_NAME, | |
1765 | }, | |
f9a5d70c | 1766 | .ccw_driver = &ctcm_ccw_driver, |
20cdffa4 | 1767 | .setup = ctcm_probe_device, |
293d984f PT |
1768 | .remove = ctcm_remove_device, |
1769 | .set_online = ctcm_new_device, | |
1770 | .set_offline = ctcm_shutdown_device, | |
b8a2d42a FB |
1771 | .freeze = ctcm_pm_suspend, |
1772 | .thaw = ctcm_pm_resume, | |
1773 | .restore = ctcm_pm_resume, | |
293d984f PT |
1774 | }; |
1775 | ||
36369569 GKH |
1776 | static ssize_t group_store(struct device_driver *ddrv, const char *buf, |
1777 | size_t count) | |
0ca8cc6f UB |
1778 | { |
1779 | int err; | |
1780 | ||
9814fdfb | 1781 | err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf); |
0ca8cc6f UB |
1782 | return err ? err : count; |
1783 | } | |
36369569 | 1784 | static DRIVER_ATTR_WO(group); |
0ca8cc6f | 1785 | |
330ce1b0 | 1786 | static struct attribute *ctcm_drv_attrs[] = { |
0ca8cc6f UB |
1787 | &driver_attr_group.attr, |
1788 | NULL, | |
1789 | }; | |
330ce1b0 SO |
1790 | static struct attribute_group ctcm_drv_attr_group = { |
1791 | .attrs = ctcm_drv_attrs, | |
0ca8cc6f | 1792 | }; |
330ce1b0 SO |
1793 | static const struct attribute_group *ctcm_drv_attr_groups[] = { |
1794 | &ctcm_drv_attr_group, | |
0ca8cc6f UB |
1795 | NULL, |
1796 | }; | |
293d984f PT |
1797 | |
1798 | /* | |
1799 | * Module related routines | |
1800 | */ | |
1801 | ||
1802 | /* | |
1803 | * Prepare to be unloaded. Free IRQ's and release all resources. | |
1804 | * This is called just before this module is unloaded. It is | |
1805 | * not called, if the usage count is !0, so we don't need to check | |
1806 | * for that. | |
1807 | */ | |
1808 | static void __exit ctcm_exit(void) | |
1809 | { | |
0ca8cc6f UB |
1810 | ccwgroup_driver_unregister(&ctcm_group_driver); |
1811 | ccw_driver_unregister(&ctcm_ccw_driver); | |
1812 | root_device_unregister(ctcm_root_dev); | |
293d984f | 1813 | ctcm_unregister_dbf_views(); |
2a7c6f2c | 1814 | pr_info("CTCM driver unloaded\n"); |
293d984f PT |
1815 | } |
1816 | ||
1817 | /* | |
1818 | * Print Banner. | |
1819 | */ | |
1820 | static void print_banner(void) | |
1821 | { | |
2a7c6f2c | 1822 | pr_info("CTCM driver initialized\n"); |
293d984f PT |
1823 | } |
1824 | ||
1825 | /** | |
1826 | * Initialize module. | |
1827 | * This is called just after the module is loaded. | |
1828 | * | |
1829 | * returns 0 on success, !0 on error. | |
1830 | */ | |
1831 | static int __init ctcm_init(void) | |
1832 | { | |
1833 | int ret; | |
1834 | ||
1835 | channels = NULL; | |
1836 | ||
1837 | ret = ctcm_register_dbf_views(); | |
0ca8cc6f UB |
1838 | if (ret) |
1839 | goto out_err; | |
1840 | ctcm_root_dev = root_device_register("ctcm"); | |
d37556eb | 1841 | ret = PTR_ERR_OR_ZERO(ctcm_root_dev); |
0ca8cc6f UB |
1842 | if (ret) |
1843 | goto register_err; | |
1844 | ret = ccw_driver_register(&ctcm_ccw_driver); | |
1845 | if (ret) | |
1846 | goto ccw_err; | |
330ce1b0 | 1847 | ctcm_group_driver.driver.groups = ctcm_drv_attr_groups; |
0ca8cc6f UB |
1848 | ret = ccwgroup_driver_register(&ctcm_group_driver); |
1849 | if (ret) | |
1850 | goto ccwgroup_err; | |
293d984f | 1851 | print_banner(); |
0ca8cc6f UB |
1852 | return 0; |
1853 | ||
1854 | ccwgroup_err: | |
1855 | ccw_driver_unregister(&ctcm_ccw_driver); | |
1856 | ccw_err: | |
1857 | root_device_unregister(ctcm_root_dev); | |
1858 | register_err: | |
1859 | ctcm_unregister_dbf_views(); | |
1860 | out_err: | |
1861 | pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n", | |
1862 | __func__, ret); | |
293d984f PT |
1863 | return ret; |
1864 | } | |
1865 | ||
1866 | module_init(ctcm_init); | |
1867 | module_exit(ctcm_exit); | |
1868 | ||
1869 | MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>"); | |
1870 | MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)"); | |
1871 | MODULE_LICENSE("GPL"); | |
1872 |