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e53e97ce DM |
1 | /* viohs.c: LDOM Virtual I/O handshake helper layer. |
2 | * | |
3 | * Copyright (C) 2007 David S. Miller <davem@davemloft.net> | |
4 | */ | |
5 | ||
6 | #include <linux/kernel.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/string.h> | |
9 | #include <linux/delay.h> | |
10 | #include <linux/sched.h> | |
11 | #include <linux/slab.h> | |
12 | ||
13 | #include <asm/ldc.h> | |
14 | #include <asm/vio.h> | |
15 | ||
16 | int vio_ldc_send(struct vio_driver_state *vio, void *data, int len) | |
17 | { | |
18 | int err, limit = 1000; | |
19 | ||
20 | err = -EINVAL; | |
21 | while (limit-- > 0) { | |
22 | err = ldc_write(vio->lp, data, len); | |
23 | if (!err || (err != -EAGAIN)) | |
24 | break; | |
25 | udelay(1); | |
26 | } | |
27 | ||
28 | return err; | |
29 | } | |
30 | EXPORT_SYMBOL(vio_ldc_send); | |
31 | ||
32 | static int send_ctrl(struct vio_driver_state *vio, | |
33 | struct vio_msg_tag *tag, int len) | |
34 | { | |
35 | tag->sid = vio_send_sid(vio); | |
36 | return vio_ldc_send(vio, tag, len); | |
37 | } | |
38 | ||
39 | static void init_tag(struct vio_msg_tag *tag, u8 type, u8 stype, u16 stype_env) | |
40 | { | |
41 | tag->type = type; | |
42 | tag->stype = stype; | |
43 | tag->stype_env = stype_env; | |
44 | } | |
45 | ||
46 | static int send_version(struct vio_driver_state *vio, u16 major, u16 minor) | |
47 | { | |
48 | struct vio_ver_info pkt; | |
49 | ||
50 | vio->_local_sid = (u32) sched_clock(); | |
51 | ||
52 | memset(&pkt, 0, sizeof(pkt)); | |
53 | init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_VER_INFO); | |
54 | pkt.major = major; | |
55 | pkt.minor = minor; | |
56 | pkt.dev_class = vio->dev_class; | |
57 | ||
58 | viodbg(HS, "SEND VERSION INFO maj[%u] min[%u] devclass[%u]\n", | |
59 | major, minor, vio->dev_class); | |
60 | ||
61 | return send_ctrl(vio, &pkt.tag, sizeof(pkt)); | |
62 | } | |
63 | ||
64 | static int start_handshake(struct vio_driver_state *vio) | |
65 | { | |
66 | int err; | |
67 | ||
68 | viodbg(HS, "START HANDSHAKE\n"); | |
69 | ||
70 | vio->hs_state = VIO_HS_INVALID; | |
71 | ||
72 | err = send_version(vio, | |
73 | vio->ver_table[0].major, | |
74 | vio->ver_table[0].minor); | |
75 | if (err < 0) | |
76 | return err; | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
81 | void vio_link_state_change(struct vio_driver_state *vio, int event) | |
82 | { | |
83 | if (event == LDC_EVENT_UP) { | |
84 | vio->hs_state = VIO_HS_INVALID; | |
85 | ||
86 | switch (vio->dev_class) { | |
87 | case VDEV_NETWORK: | |
88 | case VDEV_NETWORK_SWITCH: | |
89 | vio->dr_state = (VIO_DR_STATE_TXREQ | | |
90 | VIO_DR_STATE_RXREQ); | |
91 | break; | |
92 | ||
93 | case VDEV_DISK: | |
94 | vio->dr_state = VIO_DR_STATE_TXREQ; | |
95 | break; | |
96 | case VDEV_DISK_SERVER: | |
97 | vio->dr_state = VIO_DR_STATE_RXREQ; | |
98 | break; | |
99 | } | |
100 | start_handshake(vio); | |
101 | } | |
102 | } | |
103 | EXPORT_SYMBOL(vio_link_state_change); | |
104 | ||
105 | static int handshake_failure(struct vio_driver_state *vio) | |
106 | { | |
107 | struct vio_dring_state *dr; | |
108 | ||
109 | /* XXX Put policy here... Perhaps start a timer to fire | |
110 | * XXX in 100 ms, which will bring the link up and retry | |
111 | * XXX the handshake. | |
112 | */ | |
113 | ||
114 | viodbg(HS, "HANDSHAKE FAILURE\n"); | |
115 | ||
116 | vio->dr_state &= ~(VIO_DR_STATE_TXREG | | |
117 | VIO_DR_STATE_RXREG); | |
118 | ||
119 | dr = &vio->drings[VIO_DRIVER_RX_RING]; | |
120 | memset(dr, 0, sizeof(*dr)); | |
121 | ||
122 | kfree(vio->desc_buf); | |
123 | vio->desc_buf = NULL; | |
124 | vio->desc_buf_len = 0; | |
125 | ||
126 | vio->hs_state = VIO_HS_INVALID; | |
127 | ||
128 | return -ECONNRESET; | |
129 | } | |
130 | ||
131 | static int process_unknown(struct vio_driver_state *vio, void *arg) | |
132 | { | |
133 | struct vio_msg_tag *pkt = arg; | |
134 | ||
135 | viodbg(HS, "UNKNOWN CONTROL [%02x:%02x:%04x:%08x]\n", | |
136 | pkt->type, pkt->stype, pkt->stype_env, pkt->sid); | |
137 | ||
138 | printk(KERN_ERR "vio: ID[%lu] Resetting connection.\n", | |
139 | vio->channel_id); | |
140 | ||
141 | ldc_disconnect(vio->lp); | |
142 | ||
143 | return -ECONNRESET; | |
144 | } | |
145 | ||
146 | static int send_dreg(struct vio_driver_state *vio) | |
147 | { | |
148 | struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_TX_RING]; | |
149 | union { | |
150 | struct vio_dring_register pkt; | |
151 | char all[sizeof(struct vio_dring_register) + | |
152 | (sizeof(struct ldc_trans_cookie) * | |
153 | dr->ncookies)]; | |
154 | } u; | |
155 | int i; | |
156 | ||
157 | memset(&u, 0, sizeof(u)); | |
158 | init_tag(&u.pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_DRING_REG); | |
159 | u.pkt.dring_ident = 0; | |
160 | u.pkt.num_descr = dr->num_entries; | |
161 | u.pkt.descr_size = dr->entry_size; | |
162 | u.pkt.options = VIO_TX_DRING; | |
163 | u.pkt.num_cookies = dr->ncookies; | |
164 | ||
165 | viodbg(HS, "SEND DRING_REG INFO ndesc[%u] dsz[%u] opt[0x%x] " | |
166 | "ncookies[%u]\n", | |
167 | u.pkt.num_descr, u.pkt.descr_size, u.pkt.options, | |
168 | u.pkt.num_cookies); | |
169 | ||
170 | for (i = 0; i < dr->ncookies; i++) { | |
171 | u.pkt.cookies[i] = dr->cookies[i]; | |
172 | ||
173 | viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n", | |
174 | i, | |
175 | (unsigned long long) u.pkt.cookies[i].cookie_addr, | |
176 | (unsigned long long) u.pkt.cookies[i].cookie_size); | |
177 | } | |
178 | ||
179 | return send_ctrl(vio, &u.pkt.tag, sizeof(u)); | |
180 | } | |
181 | ||
182 | static int send_rdx(struct vio_driver_state *vio) | |
183 | { | |
184 | struct vio_rdx pkt; | |
185 | ||
186 | memset(&pkt, 0, sizeof(pkt)); | |
187 | ||
188 | init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_RDX); | |
189 | ||
190 | viodbg(HS, "SEND RDX INFO\n"); | |
191 | ||
192 | return send_ctrl(vio, &pkt.tag, sizeof(pkt)); | |
193 | } | |
194 | ||
195 | static int send_attr(struct vio_driver_state *vio) | |
196 | { | |
197 | return vio->ops->send_attr(vio); | |
198 | } | |
199 | ||
200 | static struct vio_version *find_by_major(struct vio_driver_state *vio, | |
201 | u16 major) | |
202 | { | |
203 | struct vio_version *ret = NULL; | |
204 | int i; | |
205 | ||
206 | for (i = 0; i < vio->ver_table_entries; i++) { | |
207 | struct vio_version *v = &vio->ver_table[i]; | |
208 | if (v->major <= major) { | |
209 | ret = v; | |
210 | break; | |
211 | } | |
212 | } | |
213 | return ret; | |
214 | } | |
215 | ||
216 | static int process_ver_info(struct vio_driver_state *vio, | |
217 | struct vio_ver_info *pkt) | |
218 | { | |
219 | struct vio_version *vap; | |
220 | int err; | |
221 | ||
222 | viodbg(HS, "GOT VERSION INFO maj[%u] min[%u] devclass[%u]\n", | |
223 | pkt->major, pkt->minor, pkt->dev_class); | |
224 | ||
225 | if (vio->hs_state != VIO_HS_INVALID) { | |
226 | /* XXX Perhaps invoke start_handshake? XXX */ | |
227 | memset(&vio->ver, 0, sizeof(vio->ver)); | |
228 | vio->hs_state = VIO_HS_INVALID; | |
229 | } | |
230 | ||
231 | vap = find_by_major(vio, pkt->major); | |
232 | ||
233 | vio->_peer_sid = pkt->tag.sid; | |
234 | ||
235 | if (!vap) { | |
236 | pkt->tag.stype = VIO_SUBTYPE_NACK; | |
237 | pkt->major = 0; | |
238 | pkt->minor = 0; | |
239 | viodbg(HS, "SEND VERSION NACK maj[0] min[0]\n"); | |
240 | err = send_ctrl(vio, &pkt->tag, sizeof(*pkt)); | |
241 | } else if (vap->major != pkt->major) { | |
242 | pkt->tag.stype = VIO_SUBTYPE_NACK; | |
243 | pkt->major = vap->major; | |
244 | pkt->minor = vap->minor; | |
245 | viodbg(HS, "SEND VERSION NACK maj[%u] min[%u]\n", | |
246 | pkt->major, pkt->minor); | |
247 | err = send_ctrl(vio, &pkt->tag, sizeof(*pkt)); | |
248 | } else { | |
249 | struct vio_version ver = { | |
250 | .major = pkt->major, | |
251 | .minor = pkt->minor, | |
252 | }; | |
253 | if (ver.minor > vap->minor) | |
254 | ver.minor = vap->minor; | |
255 | pkt->minor = ver.minor; | |
256 | pkt->tag.stype = VIO_SUBTYPE_ACK; | |
257 | viodbg(HS, "SEND VERSION ACK maj[%u] min[%u]\n", | |
258 | pkt->major, pkt->minor); | |
259 | err = send_ctrl(vio, &pkt->tag, sizeof(*pkt)); | |
260 | if (err > 0) { | |
261 | vio->ver = ver; | |
262 | vio->hs_state = VIO_HS_GOTVERS; | |
263 | } | |
264 | } | |
265 | if (err < 0) | |
266 | return handshake_failure(vio); | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
271 | static int process_ver_ack(struct vio_driver_state *vio, | |
272 | struct vio_ver_info *pkt) | |
273 | { | |
274 | viodbg(HS, "GOT VERSION ACK maj[%u] min[%u] devclass[%u]\n", | |
275 | pkt->major, pkt->minor, pkt->dev_class); | |
276 | ||
277 | if (vio->hs_state & VIO_HS_GOTVERS) { | |
278 | if (vio->ver.major != pkt->major || | |
279 | vio->ver.minor != pkt->minor) { | |
280 | pkt->tag.stype = VIO_SUBTYPE_NACK; | |
281 | (void) send_ctrl(vio, &pkt->tag, sizeof(*pkt)); | |
282 | return handshake_failure(vio); | |
283 | } | |
284 | } else { | |
285 | vio->ver.major = pkt->major; | |
286 | vio->ver.minor = pkt->minor; | |
287 | vio->hs_state = VIO_HS_GOTVERS; | |
288 | } | |
289 | ||
290 | switch (vio->dev_class) { | |
291 | case VDEV_NETWORK: | |
292 | case VDEV_DISK: | |
293 | if (send_attr(vio) < 0) | |
294 | return handshake_failure(vio); | |
295 | break; | |
296 | ||
297 | default: | |
298 | break; | |
299 | } | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | static int process_ver_nack(struct vio_driver_state *vio, | |
305 | struct vio_ver_info *pkt) | |
306 | { | |
307 | struct vio_version *nver; | |
308 | ||
309 | viodbg(HS, "GOT VERSION NACK maj[%u] min[%u] devclass[%u]\n", | |
310 | pkt->major, pkt->minor, pkt->dev_class); | |
311 | ||
312 | if ((pkt->major == 0 && pkt->minor == 0) || | |
313 | !(nver = find_by_major(vio, pkt->major))) | |
314 | return handshake_failure(vio); | |
315 | ||
316 | if (send_version(vio, nver->major, nver->minor) < 0) | |
317 | return handshake_failure(vio); | |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
322 | static int process_ver(struct vio_driver_state *vio, struct vio_ver_info *pkt) | |
323 | { | |
324 | switch (pkt->tag.stype) { | |
325 | case VIO_SUBTYPE_INFO: | |
326 | return process_ver_info(vio, pkt); | |
327 | ||
328 | case VIO_SUBTYPE_ACK: | |
329 | return process_ver_ack(vio, pkt); | |
330 | ||
331 | case VIO_SUBTYPE_NACK: | |
332 | return process_ver_nack(vio, pkt); | |
333 | ||
334 | default: | |
335 | return handshake_failure(vio); | |
336 | }; | |
337 | } | |
338 | ||
339 | static int process_attr(struct vio_driver_state *vio, void *pkt) | |
340 | { | |
341 | int err; | |
342 | ||
343 | if (!(vio->hs_state & VIO_HS_GOTVERS)) | |
344 | return handshake_failure(vio); | |
345 | ||
346 | err = vio->ops->handle_attr(vio, pkt); | |
347 | if (err < 0) { | |
348 | return handshake_failure(vio); | |
349 | } else { | |
350 | vio->hs_state |= VIO_HS_GOT_ATTR; | |
351 | ||
352 | if ((vio->dr_state & VIO_DR_STATE_TXREQ) && | |
353 | !(vio->hs_state & VIO_HS_SENT_DREG)) { | |
354 | if (send_dreg(vio) < 0) | |
355 | return handshake_failure(vio); | |
356 | ||
357 | vio->hs_state |= VIO_HS_SENT_DREG; | |
358 | } | |
359 | } | |
360 | return 0; | |
361 | } | |
362 | ||
363 | static int all_drings_registered(struct vio_driver_state *vio) | |
364 | { | |
365 | int need_rx, need_tx; | |
366 | ||
367 | need_rx = (vio->dr_state & VIO_DR_STATE_RXREQ); | |
368 | need_tx = (vio->dr_state & VIO_DR_STATE_TXREQ); | |
369 | ||
370 | if (need_rx && | |
371 | !(vio->dr_state & VIO_DR_STATE_RXREG)) | |
372 | return 0; | |
373 | ||
374 | if (need_tx && | |
375 | !(vio->dr_state & VIO_DR_STATE_TXREG)) | |
376 | return 0; | |
377 | ||
378 | return 1; | |
379 | } | |
380 | ||
381 | static int process_dreg_info(struct vio_driver_state *vio, | |
382 | struct vio_dring_register *pkt) | |
383 | { | |
384 | struct vio_dring_state *dr; | |
385 | int i, len; | |
386 | ||
387 | viodbg(HS, "GOT DRING_REG INFO ident[%llx] " | |
388 | "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n", | |
389 | (unsigned long long) pkt->dring_ident, | |
390 | pkt->num_descr, pkt->descr_size, pkt->options, | |
391 | pkt->num_cookies); | |
392 | ||
393 | if (!(vio->dr_state & VIO_DR_STATE_RXREQ)) | |
394 | goto send_nack; | |
395 | ||
396 | if (vio->dr_state & VIO_DR_STATE_RXREG) | |
397 | goto send_nack; | |
398 | ||
399 | vio->desc_buf = kzalloc(pkt->descr_size, GFP_ATOMIC); | |
400 | if (!vio->desc_buf) | |
401 | goto send_nack; | |
402 | ||
403 | vio->desc_buf_len = pkt->descr_size; | |
404 | ||
405 | dr = &vio->drings[VIO_DRIVER_RX_RING]; | |
406 | ||
407 | dr->num_entries = pkt->num_descr; | |
408 | dr->entry_size = pkt->descr_size; | |
409 | dr->ncookies = pkt->num_cookies; | |
410 | for (i = 0; i < dr->ncookies; i++) { | |
411 | dr->cookies[i] = pkt->cookies[i]; | |
412 | ||
413 | viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n", | |
414 | i, | |
415 | (unsigned long long) | |
416 | pkt->cookies[i].cookie_addr, | |
417 | (unsigned long long) | |
418 | pkt->cookies[i].cookie_size); | |
419 | } | |
420 | ||
421 | pkt->tag.stype = VIO_SUBTYPE_ACK; | |
422 | pkt->dring_ident = ++dr->ident; | |
423 | ||
424 | viodbg(HS, "SEND DRING_REG ACK ident[%llx]\n", | |
425 | (unsigned long long) pkt->dring_ident); | |
426 | ||
427 | len = (sizeof(*pkt) + | |
428 | (dr->ncookies * sizeof(struct ldc_trans_cookie))); | |
429 | if (send_ctrl(vio, &pkt->tag, len) < 0) | |
430 | goto send_nack; | |
431 | ||
432 | vio->dr_state |= VIO_DR_STATE_RXREG; | |
433 | ||
434 | return 0; | |
435 | ||
436 | send_nack: | |
437 | pkt->tag.stype = VIO_SUBTYPE_NACK; | |
438 | viodbg(HS, "SEND DRING_REG NACK\n"); | |
439 | (void) send_ctrl(vio, &pkt->tag, sizeof(*pkt)); | |
440 | ||
441 | return handshake_failure(vio); | |
442 | } | |
443 | ||
444 | static int process_dreg_ack(struct vio_driver_state *vio, | |
445 | struct vio_dring_register *pkt) | |
446 | { | |
447 | struct vio_dring_state *dr; | |
448 | ||
449 | viodbg(HS, "GOT DRING_REG ACK ident[%llx] " | |
450 | "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n", | |
451 | (unsigned long long) pkt->dring_ident, | |
452 | pkt->num_descr, pkt->descr_size, pkt->options, | |
453 | pkt->num_cookies); | |
454 | ||
455 | dr = &vio->drings[VIO_DRIVER_TX_RING]; | |
456 | ||
457 | if (!(vio->dr_state & VIO_DR_STATE_TXREQ)) | |
458 | return handshake_failure(vio); | |
459 | ||
460 | dr->ident = pkt->dring_ident; | |
461 | vio->dr_state |= VIO_DR_STATE_TXREG; | |
462 | ||
463 | if (all_drings_registered(vio)) { | |
464 | if (send_rdx(vio) < 0) | |
465 | return handshake_failure(vio); | |
466 | vio->hs_state = VIO_HS_SENT_RDX; | |
467 | } | |
468 | return 0; | |
469 | } | |
470 | ||
471 | static int process_dreg_nack(struct vio_driver_state *vio, | |
472 | struct vio_dring_register *pkt) | |
473 | { | |
474 | viodbg(HS, "GOT DRING_REG NACK ident[%llx] " | |
475 | "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n", | |
476 | (unsigned long long) pkt->dring_ident, | |
477 | pkt->num_descr, pkt->descr_size, pkt->options, | |
478 | pkt->num_cookies); | |
479 | ||
480 | return handshake_failure(vio); | |
481 | } | |
482 | ||
483 | static int process_dreg(struct vio_driver_state *vio, | |
484 | struct vio_dring_register *pkt) | |
485 | { | |
486 | if (!(vio->hs_state & VIO_HS_GOTVERS)) | |
487 | return handshake_failure(vio); | |
488 | ||
489 | switch (pkt->tag.stype) { | |
490 | case VIO_SUBTYPE_INFO: | |
491 | return process_dreg_info(vio, pkt); | |
492 | ||
493 | case VIO_SUBTYPE_ACK: | |
494 | return process_dreg_ack(vio, pkt); | |
495 | ||
496 | case VIO_SUBTYPE_NACK: | |
497 | return process_dreg_nack(vio, pkt); | |
498 | ||
499 | default: | |
500 | return handshake_failure(vio); | |
501 | } | |
502 | } | |
503 | ||
504 | static int process_dunreg(struct vio_driver_state *vio, | |
505 | struct vio_dring_unregister *pkt) | |
506 | { | |
507 | struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_RX_RING]; | |
508 | ||
509 | viodbg(HS, "GOT DRING_UNREG\n"); | |
510 | ||
511 | if (pkt->dring_ident != dr->ident) | |
512 | return 0; | |
513 | ||
514 | vio->dr_state &= ~VIO_DR_STATE_RXREG; | |
515 | ||
516 | memset(dr, 0, sizeof(*dr)); | |
517 | ||
518 | kfree(vio->desc_buf); | |
519 | vio->desc_buf = NULL; | |
520 | vio->desc_buf_len = 0; | |
521 | ||
522 | return 0; | |
523 | } | |
524 | ||
525 | static int process_rdx_info(struct vio_driver_state *vio, struct vio_rdx *pkt) | |
526 | { | |
527 | viodbg(HS, "GOT RDX INFO\n"); | |
528 | ||
529 | pkt->tag.stype = VIO_SUBTYPE_ACK; | |
530 | viodbg(HS, "SEND RDX ACK\n"); | |
531 | if (send_ctrl(vio, &pkt->tag, sizeof(*pkt)) < 0) | |
532 | return handshake_failure(vio); | |
533 | ||
534 | vio->hs_state |= VIO_HS_SENT_RDX_ACK; | |
535 | return 0; | |
536 | } | |
537 | ||
538 | static int process_rdx_ack(struct vio_driver_state *vio, struct vio_rdx *pkt) | |
539 | { | |
540 | viodbg(HS, "GOT RDX ACK\n"); | |
541 | ||
542 | if (!(vio->hs_state & VIO_HS_SENT_RDX)) | |
543 | return handshake_failure(vio); | |
544 | ||
545 | vio->hs_state |= VIO_HS_GOT_RDX_ACK; | |
546 | return 0; | |
547 | } | |
548 | ||
549 | static int process_rdx_nack(struct vio_driver_state *vio, struct vio_rdx *pkt) | |
550 | { | |
551 | viodbg(HS, "GOT RDX NACK\n"); | |
552 | ||
553 | return handshake_failure(vio); | |
554 | } | |
555 | ||
556 | static int process_rdx(struct vio_driver_state *vio, struct vio_rdx *pkt) | |
557 | { | |
558 | if (!all_drings_registered(vio)) | |
559 | handshake_failure(vio); | |
560 | ||
561 | switch (pkt->tag.stype) { | |
562 | case VIO_SUBTYPE_INFO: | |
563 | return process_rdx_info(vio, pkt); | |
564 | ||
565 | case VIO_SUBTYPE_ACK: | |
566 | return process_rdx_ack(vio, pkt); | |
567 | ||
568 | case VIO_SUBTYPE_NACK: | |
569 | return process_rdx_nack(vio, pkt); | |
570 | ||
571 | default: | |
572 | return handshake_failure(vio); | |
573 | } | |
574 | } | |
575 | ||
576 | int vio_control_pkt_engine(struct vio_driver_state *vio, void *pkt) | |
577 | { | |
578 | struct vio_msg_tag *tag = pkt; | |
579 | u8 prev_state = vio->hs_state; | |
580 | int err; | |
581 | ||
582 | switch (tag->stype_env) { | |
583 | case VIO_VER_INFO: | |
584 | err = process_ver(vio, pkt); | |
585 | break; | |
586 | ||
587 | case VIO_ATTR_INFO: | |
588 | err = process_attr(vio, pkt); | |
589 | break; | |
590 | ||
591 | case VIO_DRING_REG: | |
592 | err = process_dreg(vio, pkt); | |
593 | break; | |
594 | ||
595 | case VIO_DRING_UNREG: | |
596 | err = process_dunreg(vio, pkt); | |
597 | break; | |
598 | ||
599 | case VIO_RDX: | |
600 | err = process_rdx(vio, pkt); | |
601 | break; | |
602 | ||
603 | default: | |
604 | err = process_unknown(vio, pkt); | |
605 | break; | |
606 | } | |
607 | if (!err && | |
608 | vio->hs_state != prev_state && | |
609 | (vio->hs_state & VIO_HS_COMPLETE)) | |
610 | vio->ops->handshake_complete(vio); | |
611 | ||
612 | return err; | |
613 | } | |
614 | EXPORT_SYMBOL(vio_control_pkt_engine); | |
615 | ||
616 | void vio_conn_reset(struct vio_driver_state *vio) | |
617 | { | |
618 | } | |
619 | EXPORT_SYMBOL(vio_conn_reset); | |
620 | ||
621 | /* The issue is that the Solaris virtual disk server just mirrors the | |
622 | * SID values it gets from the client peer. So we work around that | |
623 | * here in vio_{validate,send}_sid() so that the drivers don't need | |
624 | * to be aware of this crap. | |
625 | */ | |
626 | int vio_validate_sid(struct vio_driver_state *vio, struct vio_msg_tag *tp) | |
627 | { | |
628 | u32 sid; | |
629 | ||
630 | /* Always let VERSION+INFO packets through unchecked, they | |
631 | * define the new SID. | |
632 | */ | |
633 | if (tp->type == VIO_TYPE_CTRL && | |
634 | tp->stype == VIO_SUBTYPE_INFO && | |
635 | tp->stype_env == VIO_VER_INFO) | |
636 | return 0; | |
637 | ||
638 | /* Ok, now figure out which SID to use. */ | |
639 | switch (vio->dev_class) { | |
640 | case VDEV_NETWORK: | |
641 | case VDEV_NETWORK_SWITCH: | |
642 | case VDEV_DISK_SERVER: | |
643 | default: | |
644 | sid = vio->_peer_sid; | |
645 | break; | |
646 | ||
647 | case VDEV_DISK: | |
648 | sid = vio->_local_sid; | |
649 | break; | |
650 | } | |
651 | ||
652 | if (sid == tp->sid) | |
653 | return 0; | |
654 | viodbg(DATA, "BAD SID tag->sid[%08x] peer_sid[%08x] local_sid[%08x]\n", | |
655 | tp->sid, vio->_peer_sid, vio->_local_sid); | |
656 | return -EINVAL; | |
657 | } | |
658 | EXPORT_SYMBOL(vio_validate_sid); | |
659 | ||
660 | u32 vio_send_sid(struct vio_driver_state *vio) | |
661 | { | |
662 | switch (vio->dev_class) { | |
663 | case VDEV_NETWORK: | |
664 | case VDEV_NETWORK_SWITCH: | |
665 | case VDEV_DISK: | |
666 | default: | |
667 | return vio->_local_sid; | |
668 | ||
669 | case VDEV_DISK_SERVER: | |
670 | return vio->_peer_sid; | |
671 | } | |
672 | } | |
673 | EXPORT_SYMBOL(vio_send_sid); | |
674 | ||
675 | extern int vio_ldc_alloc(struct vio_driver_state *vio, | |
676 | struct ldc_channel_config *base_cfg, | |
677 | void *event_arg) | |
678 | { | |
679 | struct ldc_channel_config cfg = *base_cfg; | |
680 | struct ldc_channel *lp; | |
681 | const u64 *id; | |
682 | ||
683 | id = md_get_property(vio->endpoint, "id", NULL); | |
684 | if (!id) { | |
685 | printk(KERN_ERR "%s: Channel lacks id property.\n", | |
686 | vio->name); | |
687 | return -ENODEV; | |
688 | } | |
689 | ||
690 | vio->channel_id = *id; | |
691 | ||
692 | cfg.rx_irq = vio->rx_irq; | |
693 | cfg.tx_irq = vio->tx_irq; | |
694 | ||
695 | lp = ldc_alloc(vio->channel_id, &cfg, event_arg); | |
696 | if (IS_ERR(lp)) | |
697 | return PTR_ERR(lp); | |
698 | ||
699 | vio->lp = lp; | |
700 | ||
701 | return 0; | |
702 | } | |
703 | EXPORT_SYMBOL(vio_ldc_alloc); | |
704 | ||
705 | void vio_ldc_free(struct vio_driver_state *vio) | |
706 | { | |
707 | ldc_free(vio->lp); | |
708 | vio->lp = NULL; | |
709 | ||
710 | kfree(vio->desc_buf); | |
711 | vio->desc_buf = NULL; | |
712 | vio->desc_buf_len = 0; | |
713 | } | |
714 | EXPORT_SYMBOL(vio_ldc_free); | |
715 | ||
716 | void vio_port_up(struct vio_driver_state *vio) | |
717 | { | |
718 | unsigned long flags; | |
719 | int err, state; | |
720 | ||
721 | spin_lock_irqsave(&vio->lock, flags); | |
722 | ||
723 | state = ldc_state(vio->lp); | |
724 | ||
725 | err = 0; | |
726 | if (state == LDC_STATE_INIT) { | |
727 | err = ldc_bind(vio->lp); | |
728 | if (err) | |
729 | printk(KERN_WARNING "%s: Port %lu bind failed, " | |
730 | "err=%d\n", | |
731 | vio->name, vio->channel_id, err); | |
732 | } | |
733 | ||
734 | if (!err) { | |
735 | err = ldc_connect(vio->lp); | |
736 | if (err) | |
737 | printk(KERN_WARNING "%s: Port %lu connect failed, " | |
738 | "err=%d\n", | |
739 | vio->name, vio->channel_id, err); | |
740 | } | |
741 | if (err) { | |
742 | unsigned long expires = jiffies + HZ; | |
743 | ||
744 | expires = round_jiffies(expires); | |
745 | mod_timer(&vio->timer, expires); | |
746 | } | |
747 | ||
748 | spin_unlock_irqrestore(&vio->lock, flags); | |
749 | } | |
750 | EXPORT_SYMBOL(vio_port_up); | |
751 | ||
752 | static void vio_port_timer(unsigned long _arg) | |
753 | { | |
754 | struct vio_driver_state *vio = (struct vio_driver_state *) _arg; | |
755 | ||
756 | vio_port_up(vio); | |
757 | } | |
758 | ||
759 | int vio_driver_init(struct vio_driver_state *vio, struct vio_dev *vdev, | |
760 | u8 dev_class, struct mdesc_node *channel_endpoint, | |
761 | struct vio_version *ver_table, int ver_table_size, | |
762 | struct vio_driver_ops *ops, char *name) | |
763 | { | |
764 | switch (dev_class) { | |
765 | case VDEV_NETWORK: | |
766 | case VDEV_NETWORK_SWITCH: | |
767 | case VDEV_DISK: | |
768 | case VDEV_DISK_SERVER: | |
769 | break; | |
770 | ||
771 | default: | |
772 | return -EINVAL; | |
773 | } | |
774 | ||
775 | if (!ops->send_attr || | |
776 | !ops->handle_attr || | |
777 | !ops->handshake_complete) | |
778 | return -EINVAL; | |
779 | ||
780 | if (!channel_endpoint) | |
781 | return -EINVAL; | |
782 | ||
783 | if (!ver_table || ver_table_size < 0) | |
784 | return -EINVAL; | |
785 | ||
786 | if (!name) | |
787 | return -EINVAL; | |
788 | ||
789 | spin_lock_init(&vio->lock); | |
790 | ||
791 | vio->name = name; | |
792 | ||
793 | vio->dev_class = dev_class; | |
794 | vio->vdev = vdev; | |
795 | ||
796 | vio->endpoint = channel_endpoint; | |
797 | vio->tx_irq = channel_endpoint->irqs[0]; | |
798 | vio->rx_irq = channel_endpoint->irqs[1]; | |
799 | ||
800 | vio->ver_table = ver_table; | |
801 | vio->ver_table_entries = ver_table_size; | |
802 | ||
803 | vio->ops = ops; | |
804 | ||
805 | setup_timer(&vio->timer, vio_port_timer, (unsigned long) vio); | |
806 | ||
807 | return 0; | |
808 | } | |
809 | EXPORT_SYMBOL(vio_driver_init); |