Commit | Line | Data |
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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> | |
066bcaca | 7 | #include <linux/export.h> |
e53e97ce DM |
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 | ||
a4cd1845 DM |
81 | static void flush_rx_dring(struct vio_driver_state *vio) |
82 | { | |
83 | struct vio_dring_state *dr; | |
84 | u64 ident; | |
85 | ||
86 | BUG_ON(!(vio->dr_state & VIO_DR_STATE_RXREG)); | |
87 | ||
88 | dr = &vio->drings[VIO_DRIVER_RX_RING]; | |
89 | ident = dr->ident; | |
90 | ||
91 | BUG_ON(!vio->desc_buf); | |
92 | kfree(vio->desc_buf); | |
a5f8967e | 93 | vio->desc_buf = NULL; |
a4cd1845 DM |
94 | |
95 | memset(dr, 0, sizeof(*dr)); | |
96 | dr->ident = ident; | |
97 | } | |
98 | ||
e53e97ce DM |
99 | void vio_link_state_change(struct vio_driver_state *vio, int event) |
100 | { | |
101 | if (event == LDC_EVENT_UP) { | |
102 | vio->hs_state = VIO_HS_INVALID; | |
103 | ||
104 | switch (vio->dev_class) { | |
105 | case VDEV_NETWORK: | |
106 | case VDEV_NETWORK_SWITCH: | |
107 | vio->dr_state = (VIO_DR_STATE_TXREQ | | |
108 | VIO_DR_STATE_RXREQ); | |
109 | break; | |
110 | ||
111 | case VDEV_DISK: | |
112 | vio->dr_state = VIO_DR_STATE_TXREQ; | |
113 | break; | |
114 | case VDEV_DISK_SERVER: | |
115 | vio->dr_state = VIO_DR_STATE_RXREQ; | |
116 | break; | |
117 | } | |
118 | start_handshake(vio); | |
a4cd1845 DM |
119 | } else if (event == LDC_EVENT_RESET) { |
120 | vio->hs_state = VIO_HS_INVALID; | |
121 | ||
122 | if (vio->dr_state & VIO_DR_STATE_RXREG) | |
123 | flush_rx_dring(vio); | |
124 | ||
125 | vio->dr_state = 0x00; | |
126 | memset(&vio->ver, 0, sizeof(vio->ver)); | |
127 | ||
128 | ldc_disconnect(vio->lp); | |
e53e97ce DM |
129 | } |
130 | } | |
131 | EXPORT_SYMBOL(vio_link_state_change); | |
132 | ||
133 | static int handshake_failure(struct vio_driver_state *vio) | |
134 | { | |
135 | struct vio_dring_state *dr; | |
136 | ||
137 | /* XXX Put policy here... Perhaps start a timer to fire | |
138 | * XXX in 100 ms, which will bring the link up and retry | |
139 | * XXX the handshake. | |
140 | */ | |
141 | ||
142 | viodbg(HS, "HANDSHAKE FAILURE\n"); | |
143 | ||
144 | vio->dr_state &= ~(VIO_DR_STATE_TXREG | | |
145 | VIO_DR_STATE_RXREG); | |
146 | ||
147 | dr = &vio->drings[VIO_DRIVER_RX_RING]; | |
148 | memset(dr, 0, sizeof(*dr)); | |
149 | ||
150 | kfree(vio->desc_buf); | |
151 | vio->desc_buf = NULL; | |
152 | vio->desc_buf_len = 0; | |
153 | ||
154 | vio->hs_state = VIO_HS_INVALID; | |
155 | ||
156 | return -ECONNRESET; | |
157 | } | |
158 | ||
159 | static int process_unknown(struct vio_driver_state *vio, void *arg) | |
160 | { | |
161 | struct vio_msg_tag *pkt = arg; | |
162 | ||
163 | viodbg(HS, "UNKNOWN CONTROL [%02x:%02x:%04x:%08x]\n", | |
164 | pkt->type, pkt->stype, pkt->stype_env, pkt->sid); | |
165 | ||
166 | printk(KERN_ERR "vio: ID[%lu] Resetting connection.\n", | |
43fdf274 | 167 | vio->vdev->channel_id); |
e53e97ce DM |
168 | |
169 | ldc_disconnect(vio->lp); | |
170 | ||
171 | return -ECONNRESET; | |
172 | } | |
173 | ||
174 | static int send_dreg(struct vio_driver_state *vio) | |
175 | { | |
176 | struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_TX_RING]; | |
177 | union { | |
178 | struct vio_dring_register pkt; | |
179 | char all[sizeof(struct vio_dring_register) + | |
180 | (sizeof(struct ldc_trans_cookie) * | |
181 | dr->ncookies)]; | |
182 | } u; | |
183 | int i; | |
184 | ||
185 | memset(&u, 0, sizeof(u)); | |
186 | init_tag(&u.pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_DRING_REG); | |
187 | u.pkt.dring_ident = 0; | |
188 | u.pkt.num_descr = dr->num_entries; | |
189 | u.pkt.descr_size = dr->entry_size; | |
190 | u.pkt.options = VIO_TX_DRING; | |
191 | u.pkt.num_cookies = dr->ncookies; | |
192 | ||
193 | viodbg(HS, "SEND DRING_REG INFO ndesc[%u] dsz[%u] opt[0x%x] " | |
194 | "ncookies[%u]\n", | |
195 | u.pkt.num_descr, u.pkt.descr_size, u.pkt.options, | |
196 | u.pkt.num_cookies); | |
197 | ||
198 | for (i = 0; i < dr->ncookies; i++) { | |
199 | u.pkt.cookies[i] = dr->cookies[i]; | |
200 | ||
201 | viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n", | |
202 | i, | |
203 | (unsigned long long) u.pkt.cookies[i].cookie_addr, | |
204 | (unsigned long long) u.pkt.cookies[i].cookie_size); | |
205 | } | |
206 | ||
207 | return send_ctrl(vio, &u.pkt.tag, sizeof(u)); | |
208 | } | |
209 | ||
210 | static int send_rdx(struct vio_driver_state *vio) | |
211 | { | |
212 | struct vio_rdx pkt; | |
213 | ||
214 | memset(&pkt, 0, sizeof(pkt)); | |
215 | ||
216 | init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_RDX); | |
217 | ||
218 | viodbg(HS, "SEND RDX INFO\n"); | |
219 | ||
220 | return send_ctrl(vio, &pkt.tag, sizeof(pkt)); | |
221 | } | |
222 | ||
223 | static int send_attr(struct vio_driver_state *vio) | |
224 | { | |
225 | return vio->ops->send_attr(vio); | |
226 | } | |
227 | ||
228 | static struct vio_version *find_by_major(struct vio_driver_state *vio, | |
229 | u16 major) | |
230 | { | |
231 | struct vio_version *ret = NULL; | |
232 | int i; | |
233 | ||
234 | for (i = 0; i < vio->ver_table_entries; i++) { | |
235 | struct vio_version *v = &vio->ver_table[i]; | |
236 | if (v->major <= major) { | |
237 | ret = v; | |
238 | break; | |
239 | } | |
240 | } | |
241 | return ret; | |
242 | } | |
243 | ||
244 | static int process_ver_info(struct vio_driver_state *vio, | |
245 | struct vio_ver_info *pkt) | |
246 | { | |
247 | struct vio_version *vap; | |
248 | int err; | |
249 | ||
250 | viodbg(HS, "GOT VERSION INFO maj[%u] min[%u] devclass[%u]\n", | |
251 | pkt->major, pkt->minor, pkt->dev_class); | |
252 | ||
253 | if (vio->hs_state != VIO_HS_INVALID) { | |
254 | /* XXX Perhaps invoke start_handshake? XXX */ | |
255 | memset(&vio->ver, 0, sizeof(vio->ver)); | |
256 | vio->hs_state = VIO_HS_INVALID; | |
257 | } | |
258 | ||
259 | vap = find_by_major(vio, pkt->major); | |
260 | ||
261 | vio->_peer_sid = pkt->tag.sid; | |
262 | ||
263 | if (!vap) { | |
264 | pkt->tag.stype = VIO_SUBTYPE_NACK; | |
265 | pkt->major = 0; | |
266 | pkt->minor = 0; | |
267 | viodbg(HS, "SEND VERSION NACK maj[0] min[0]\n"); | |
268 | err = send_ctrl(vio, &pkt->tag, sizeof(*pkt)); | |
269 | } else if (vap->major != pkt->major) { | |
270 | pkt->tag.stype = VIO_SUBTYPE_NACK; | |
271 | pkt->major = vap->major; | |
272 | pkt->minor = vap->minor; | |
273 | viodbg(HS, "SEND VERSION NACK maj[%u] min[%u]\n", | |
274 | pkt->major, pkt->minor); | |
275 | err = send_ctrl(vio, &pkt->tag, sizeof(*pkt)); | |
276 | } else { | |
277 | struct vio_version ver = { | |
278 | .major = pkt->major, | |
279 | .minor = pkt->minor, | |
280 | }; | |
281 | if (ver.minor > vap->minor) | |
282 | ver.minor = vap->minor; | |
283 | pkt->minor = ver.minor; | |
284 | pkt->tag.stype = VIO_SUBTYPE_ACK; | |
285 | viodbg(HS, "SEND VERSION ACK maj[%u] min[%u]\n", | |
286 | pkt->major, pkt->minor); | |
287 | err = send_ctrl(vio, &pkt->tag, sizeof(*pkt)); | |
288 | if (err > 0) { | |
289 | vio->ver = ver; | |
290 | vio->hs_state = VIO_HS_GOTVERS; | |
291 | } | |
292 | } | |
293 | if (err < 0) | |
294 | return handshake_failure(vio); | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
299 | static int process_ver_ack(struct vio_driver_state *vio, | |
300 | struct vio_ver_info *pkt) | |
301 | { | |
302 | viodbg(HS, "GOT VERSION ACK maj[%u] min[%u] devclass[%u]\n", | |
303 | pkt->major, pkt->minor, pkt->dev_class); | |
304 | ||
305 | if (vio->hs_state & VIO_HS_GOTVERS) { | |
306 | if (vio->ver.major != pkt->major || | |
307 | vio->ver.minor != pkt->minor) { | |
308 | pkt->tag.stype = VIO_SUBTYPE_NACK; | |
309 | (void) send_ctrl(vio, &pkt->tag, sizeof(*pkt)); | |
310 | return handshake_failure(vio); | |
311 | } | |
312 | } else { | |
313 | vio->ver.major = pkt->major; | |
314 | vio->ver.minor = pkt->minor; | |
315 | vio->hs_state = VIO_HS_GOTVERS; | |
316 | } | |
317 | ||
318 | switch (vio->dev_class) { | |
319 | case VDEV_NETWORK: | |
320 | case VDEV_DISK: | |
321 | if (send_attr(vio) < 0) | |
322 | return handshake_failure(vio); | |
323 | break; | |
324 | ||
325 | default: | |
326 | break; | |
327 | } | |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
332 | static int process_ver_nack(struct vio_driver_state *vio, | |
333 | struct vio_ver_info *pkt) | |
334 | { | |
335 | struct vio_version *nver; | |
336 | ||
337 | viodbg(HS, "GOT VERSION NACK maj[%u] min[%u] devclass[%u]\n", | |
338 | pkt->major, pkt->minor, pkt->dev_class); | |
339 | ||
2eac5a0d SR |
340 | if (pkt->major == 0 && pkt->minor == 0) |
341 | return handshake_failure(vio); | |
342 | nver = find_by_major(vio, pkt->major); | |
343 | if (!nver) | |
e53e97ce DM |
344 | return handshake_failure(vio); |
345 | ||
346 | if (send_version(vio, nver->major, nver->minor) < 0) | |
347 | return handshake_failure(vio); | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
352 | static int process_ver(struct vio_driver_state *vio, struct vio_ver_info *pkt) | |
353 | { | |
354 | switch (pkt->tag.stype) { | |
355 | case VIO_SUBTYPE_INFO: | |
356 | return process_ver_info(vio, pkt); | |
357 | ||
358 | case VIO_SUBTYPE_ACK: | |
359 | return process_ver_ack(vio, pkt); | |
360 | ||
361 | case VIO_SUBTYPE_NACK: | |
362 | return process_ver_nack(vio, pkt); | |
363 | ||
364 | default: | |
365 | return handshake_failure(vio); | |
6cb79b3f | 366 | } |
e53e97ce DM |
367 | } |
368 | ||
369 | static int process_attr(struct vio_driver_state *vio, void *pkt) | |
370 | { | |
371 | int err; | |
372 | ||
373 | if (!(vio->hs_state & VIO_HS_GOTVERS)) | |
374 | return handshake_failure(vio); | |
375 | ||
376 | err = vio->ops->handle_attr(vio, pkt); | |
377 | if (err < 0) { | |
378 | return handshake_failure(vio); | |
379 | } else { | |
380 | vio->hs_state |= VIO_HS_GOT_ATTR; | |
381 | ||
382 | if ((vio->dr_state & VIO_DR_STATE_TXREQ) && | |
383 | !(vio->hs_state & VIO_HS_SENT_DREG)) { | |
384 | if (send_dreg(vio) < 0) | |
385 | return handshake_failure(vio); | |
386 | ||
387 | vio->hs_state |= VIO_HS_SENT_DREG; | |
388 | } | |
389 | } | |
390 | return 0; | |
391 | } | |
392 | ||
393 | static int all_drings_registered(struct vio_driver_state *vio) | |
394 | { | |
395 | int need_rx, need_tx; | |
396 | ||
397 | need_rx = (vio->dr_state & VIO_DR_STATE_RXREQ); | |
398 | need_tx = (vio->dr_state & VIO_DR_STATE_TXREQ); | |
399 | ||
400 | if (need_rx && | |
401 | !(vio->dr_state & VIO_DR_STATE_RXREG)) | |
402 | return 0; | |
403 | ||
404 | if (need_tx && | |
405 | !(vio->dr_state & VIO_DR_STATE_TXREG)) | |
406 | return 0; | |
407 | ||
408 | return 1; | |
409 | } | |
410 | ||
411 | static int process_dreg_info(struct vio_driver_state *vio, | |
412 | struct vio_dring_register *pkt) | |
413 | { | |
414 | struct vio_dring_state *dr; | |
415 | int i, len; | |
416 | ||
417 | viodbg(HS, "GOT DRING_REG INFO ident[%llx] " | |
418 | "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n", | |
419 | (unsigned long long) pkt->dring_ident, | |
420 | pkt->num_descr, pkt->descr_size, pkt->options, | |
421 | pkt->num_cookies); | |
422 | ||
423 | if (!(vio->dr_state & VIO_DR_STATE_RXREQ)) | |
424 | goto send_nack; | |
425 | ||
426 | if (vio->dr_state & VIO_DR_STATE_RXREG) | |
427 | goto send_nack; | |
428 | ||
a4cd1845 DM |
429 | BUG_ON(vio->desc_buf); |
430 | ||
e53e97ce DM |
431 | vio->desc_buf = kzalloc(pkt->descr_size, GFP_ATOMIC); |
432 | if (!vio->desc_buf) | |
433 | goto send_nack; | |
434 | ||
435 | vio->desc_buf_len = pkt->descr_size; | |
436 | ||
437 | dr = &vio->drings[VIO_DRIVER_RX_RING]; | |
438 | ||
439 | dr->num_entries = pkt->num_descr; | |
440 | dr->entry_size = pkt->descr_size; | |
441 | dr->ncookies = pkt->num_cookies; | |
442 | for (i = 0; i < dr->ncookies; i++) { | |
443 | dr->cookies[i] = pkt->cookies[i]; | |
444 | ||
445 | viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n", | |
446 | i, | |
447 | (unsigned long long) | |
448 | pkt->cookies[i].cookie_addr, | |
449 | (unsigned long long) | |
450 | pkt->cookies[i].cookie_size); | |
451 | } | |
452 | ||
453 | pkt->tag.stype = VIO_SUBTYPE_ACK; | |
454 | pkt->dring_ident = ++dr->ident; | |
455 | ||
456 | viodbg(HS, "SEND DRING_REG ACK ident[%llx]\n", | |
457 | (unsigned long long) pkt->dring_ident); | |
458 | ||
459 | len = (sizeof(*pkt) + | |
460 | (dr->ncookies * sizeof(struct ldc_trans_cookie))); | |
461 | if (send_ctrl(vio, &pkt->tag, len) < 0) | |
462 | goto send_nack; | |
463 | ||
464 | vio->dr_state |= VIO_DR_STATE_RXREG; | |
465 | ||
466 | return 0; | |
467 | ||
468 | send_nack: | |
469 | pkt->tag.stype = VIO_SUBTYPE_NACK; | |
470 | viodbg(HS, "SEND DRING_REG NACK\n"); | |
471 | (void) send_ctrl(vio, &pkt->tag, sizeof(*pkt)); | |
472 | ||
473 | return handshake_failure(vio); | |
474 | } | |
475 | ||
476 | static int process_dreg_ack(struct vio_driver_state *vio, | |
477 | struct vio_dring_register *pkt) | |
478 | { | |
479 | struct vio_dring_state *dr; | |
480 | ||
481 | viodbg(HS, "GOT DRING_REG ACK ident[%llx] " | |
482 | "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n", | |
483 | (unsigned long long) pkt->dring_ident, | |
484 | pkt->num_descr, pkt->descr_size, pkt->options, | |
485 | pkt->num_cookies); | |
486 | ||
487 | dr = &vio->drings[VIO_DRIVER_TX_RING]; | |
488 | ||
489 | if (!(vio->dr_state & VIO_DR_STATE_TXREQ)) | |
490 | return handshake_failure(vio); | |
491 | ||
492 | dr->ident = pkt->dring_ident; | |
493 | vio->dr_state |= VIO_DR_STATE_TXREG; | |
494 | ||
495 | if (all_drings_registered(vio)) { | |
496 | if (send_rdx(vio) < 0) | |
497 | return handshake_failure(vio); | |
498 | vio->hs_state = VIO_HS_SENT_RDX; | |
499 | } | |
500 | return 0; | |
501 | } | |
502 | ||
503 | static int process_dreg_nack(struct vio_driver_state *vio, | |
504 | struct vio_dring_register *pkt) | |
505 | { | |
506 | viodbg(HS, "GOT DRING_REG NACK ident[%llx] " | |
507 | "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n", | |
508 | (unsigned long long) pkt->dring_ident, | |
509 | pkt->num_descr, pkt->descr_size, pkt->options, | |
510 | pkt->num_cookies); | |
511 | ||
512 | return handshake_failure(vio); | |
513 | } | |
514 | ||
515 | static int process_dreg(struct vio_driver_state *vio, | |
516 | struct vio_dring_register *pkt) | |
517 | { | |
518 | if (!(vio->hs_state & VIO_HS_GOTVERS)) | |
519 | return handshake_failure(vio); | |
520 | ||
521 | switch (pkt->tag.stype) { | |
522 | case VIO_SUBTYPE_INFO: | |
523 | return process_dreg_info(vio, pkt); | |
524 | ||
525 | case VIO_SUBTYPE_ACK: | |
526 | return process_dreg_ack(vio, pkt); | |
527 | ||
528 | case VIO_SUBTYPE_NACK: | |
529 | return process_dreg_nack(vio, pkt); | |
530 | ||
531 | default: | |
532 | return handshake_failure(vio); | |
533 | } | |
534 | } | |
535 | ||
536 | static int process_dunreg(struct vio_driver_state *vio, | |
537 | struct vio_dring_unregister *pkt) | |
538 | { | |
539 | struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_RX_RING]; | |
540 | ||
541 | viodbg(HS, "GOT DRING_UNREG\n"); | |
542 | ||
543 | if (pkt->dring_ident != dr->ident) | |
544 | return 0; | |
545 | ||
546 | vio->dr_state &= ~VIO_DR_STATE_RXREG; | |
547 | ||
548 | memset(dr, 0, sizeof(*dr)); | |
549 | ||
550 | kfree(vio->desc_buf); | |
551 | vio->desc_buf = NULL; | |
552 | vio->desc_buf_len = 0; | |
553 | ||
554 | return 0; | |
555 | } | |
556 | ||
557 | static int process_rdx_info(struct vio_driver_state *vio, struct vio_rdx *pkt) | |
558 | { | |
559 | viodbg(HS, "GOT RDX INFO\n"); | |
560 | ||
561 | pkt->tag.stype = VIO_SUBTYPE_ACK; | |
562 | viodbg(HS, "SEND RDX ACK\n"); | |
563 | if (send_ctrl(vio, &pkt->tag, sizeof(*pkt)) < 0) | |
564 | return handshake_failure(vio); | |
565 | ||
566 | vio->hs_state |= VIO_HS_SENT_RDX_ACK; | |
567 | return 0; | |
568 | } | |
569 | ||
570 | static int process_rdx_ack(struct vio_driver_state *vio, struct vio_rdx *pkt) | |
571 | { | |
572 | viodbg(HS, "GOT RDX ACK\n"); | |
573 | ||
574 | if (!(vio->hs_state & VIO_HS_SENT_RDX)) | |
575 | return handshake_failure(vio); | |
576 | ||
577 | vio->hs_state |= VIO_HS_GOT_RDX_ACK; | |
578 | return 0; | |
579 | } | |
580 | ||
581 | static int process_rdx_nack(struct vio_driver_state *vio, struct vio_rdx *pkt) | |
582 | { | |
583 | viodbg(HS, "GOT RDX NACK\n"); | |
584 | ||
585 | return handshake_failure(vio); | |
586 | } | |
587 | ||
588 | static int process_rdx(struct vio_driver_state *vio, struct vio_rdx *pkt) | |
589 | { | |
590 | if (!all_drings_registered(vio)) | |
591 | handshake_failure(vio); | |
592 | ||
593 | switch (pkt->tag.stype) { | |
594 | case VIO_SUBTYPE_INFO: | |
595 | return process_rdx_info(vio, pkt); | |
596 | ||
597 | case VIO_SUBTYPE_ACK: | |
598 | return process_rdx_ack(vio, pkt); | |
599 | ||
600 | case VIO_SUBTYPE_NACK: | |
601 | return process_rdx_nack(vio, pkt); | |
602 | ||
603 | default: | |
604 | return handshake_failure(vio); | |
605 | } | |
606 | } | |
607 | ||
608 | int vio_control_pkt_engine(struct vio_driver_state *vio, void *pkt) | |
609 | { | |
610 | struct vio_msg_tag *tag = pkt; | |
611 | u8 prev_state = vio->hs_state; | |
612 | int err; | |
613 | ||
614 | switch (tag->stype_env) { | |
615 | case VIO_VER_INFO: | |
616 | err = process_ver(vio, pkt); | |
617 | break; | |
618 | ||
619 | case VIO_ATTR_INFO: | |
620 | err = process_attr(vio, pkt); | |
621 | break; | |
622 | ||
623 | case VIO_DRING_REG: | |
624 | err = process_dreg(vio, pkt); | |
625 | break; | |
626 | ||
627 | case VIO_DRING_UNREG: | |
628 | err = process_dunreg(vio, pkt); | |
629 | break; | |
630 | ||
631 | case VIO_RDX: | |
632 | err = process_rdx(vio, pkt); | |
633 | break; | |
634 | ||
635 | default: | |
636 | err = process_unknown(vio, pkt); | |
637 | break; | |
638 | } | |
639 | if (!err && | |
640 | vio->hs_state != prev_state && | |
641 | (vio->hs_state & VIO_HS_COMPLETE)) | |
642 | vio->ops->handshake_complete(vio); | |
643 | ||
644 | return err; | |
645 | } | |
646 | EXPORT_SYMBOL(vio_control_pkt_engine); | |
647 | ||
648 | void vio_conn_reset(struct vio_driver_state *vio) | |
649 | { | |
650 | } | |
651 | EXPORT_SYMBOL(vio_conn_reset); | |
652 | ||
653 | /* The issue is that the Solaris virtual disk server just mirrors the | |
654 | * SID values it gets from the client peer. So we work around that | |
655 | * here in vio_{validate,send}_sid() so that the drivers don't need | |
656 | * to be aware of this crap. | |
657 | */ | |
658 | int vio_validate_sid(struct vio_driver_state *vio, struct vio_msg_tag *tp) | |
659 | { | |
660 | u32 sid; | |
661 | ||
662 | /* Always let VERSION+INFO packets through unchecked, they | |
663 | * define the new SID. | |
664 | */ | |
665 | if (tp->type == VIO_TYPE_CTRL && | |
666 | tp->stype == VIO_SUBTYPE_INFO && | |
667 | tp->stype_env == VIO_VER_INFO) | |
668 | return 0; | |
669 | ||
670 | /* Ok, now figure out which SID to use. */ | |
671 | switch (vio->dev_class) { | |
672 | case VDEV_NETWORK: | |
673 | case VDEV_NETWORK_SWITCH: | |
674 | case VDEV_DISK_SERVER: | |
675 | default: | |
676 | sid = vio->_peer_sid; | |
677 | break; | |
678 | ||
679 | case VDEV_DISK: | |
680 | sid = vio->_local_sid; | |
681 | break; | |
682 | } | |
683 | ||
684 | if (sid == tp->sid) | |
685 | return 0; | |
686 | viodbg(DATA, "BAD SID tag->sid[%08x] peer_sid[%08x] local_sid[%08x]\n", | |
687 | tp->sid, vio->_peer_sid, vio->_local_sid); | |
688 | return -EINVAL; | |
689 | } | |
690 | EXPORT_SYMBOL(vio_validate_sid); | |
691 | ||
692 | u32 vio_send_sid(struct vio_driver_state *vio) | |
693 | { | |
694 | switch (vio->dev_class) { | |
695 | case VDEV_NETWORK: | |
696 | case VDEV_NETWORK_SWITCH: | |
697 | case VDEV_DISK: | |
698 | default: | |
699 | return vio->_local_sid; | |
700 | ||
701 | case VDEV_DISK_SERVER: | |
702 | return vio->_peer_sid; | |
703 | } | |
704 | } | |
705 | EXPORT_SYMBOL(vio_send_sid); | |
706 | ||
55fe9771 | 707 | int vio_ldc_alloc(struct vio_driver_state *vio, |
e53e97ce DM |
708 | struct ldc_channel_config *base_cfg, |
709 | void *event_arg) | |
710 | { | |
711 | struct ldc_channel_config cfg = *base_cfg; | |
712 | struct ldc_channel *lp; | |
e53e97ce | 713 | |
43fdf274 DM |
714 | cfg.tx_irq = vio->vdev->tx_irq; |
715 | cfg.rx_irq = vio->vdev->rx_irq; | |
e53e97ce | 716 | |
43fdf274 | 717 | lp = ldc_alloc(vio->vdev->channel_id, &cfg, event_arg); |
e53e97ce DM |
718 | if (IS_ERR(lp)) |
719 | return PTR_ERR(lp); | |
720 | ||
721 | vio->lp = lp; | |
722 | ||
723 | return 0; | |
724 | } | |
725 | EXPORT_SYMBOL(vio_ldc_alloc); | |
726 | ||
727 | void vio_ldc_free(struct vio_driver_state *vio) | |
728 | { | |
729 | ldc_free(vio->lp); | |
730 | vio->lp = NULL; | |
731 | ||
732 | kfree(vio->desc_buf); | |
733 | vio->desc_buf = NULL; | |
734 | vio->desc_buf_len = 0; | |
735 | } | |
736 | EXPORT_SYMBOL(vio_ldc_free); | |
737 | ||
738 | void vio_port_up(struct vio_driver_state *vio) | |
739 | { | |
740 | unsigned long flags; | |
741 | int err, state; | |
742 | ||
743 | spin_lock_irqsave(&vio->lock, flags); | |
744 | ||
745 | state = ldc_state(vio->lp); | |
746 | ||
747 | err = 0; | |
748 | if (state == LDC_STATE_INIT) { | |
133f09a1 | 749 | err = ldc_bind(vio->lp, vio->name); |
e53e97ce DM |
750 | if (err) |
751 | printk(KERN_WARNING "%s: Port %lu bind failed, " | |
752 | "err=%d\n", | |
43fdf274 | 753 | vio->name, vio->vdev->channel_id, err); |
e53e97ce DM |
754 | } |
755 | ||
756 | if (!err) { | |
757 | err = ldc_connect(vio->lp); | |
758 | if (err) | |
759 | printk(KERN_WARNING "%s: Port %lu connect failed, " | |
760 | "err=%d\n", | |
43fdf274 | 761 | vio->name, vio->vdev->channel_id, err); |
e53e97ce DM |
762 | } |
763 | if (err) { | |
764 | unsigned long expires = jiffies + HZ; | |
765 | ||
766 | expires = round_jiffies(expires); | |
767 | mod_timer(&vio->timer, expires); | |
768 | } | |
769 | ||
770 | spin_unlock_irqrestore(&vio->lock, flags); | |
771 | } | |
772 | EXPORT_SYMBOL(vio_port_up); | |
773 | ||
774 | static void vio_port_timer(unsigned long _arg) | |
775 | { | |
776 | struct vio_driver_state *vio = (struct vio_driver_state *) _arg; | |
777 | ||
778 | vio_port_up(vio); | |
779 | } | |
780 | ||
781 | int vio_driver_init(struct vio_driver_state *vio, struct vio_dev *vdev, | |
43fdf274 DM |
782 | u8 dev_class, struct vio_version *ver_table, |
783 | int ver_table_size, struct vio_driver_ops *ops, | |
784 | char *name) | |
e53e97ce DM |
785 | { |
786 | switch (dev_class) { | |
787 | case VDEV_NETWORK: | |
788 | case VDEV_NETWORK_SWITCH: | |
789 | case VDEV_DISK: | |
790 | case VDEV_DISK_SERVER: | |
791 | break; | |
792 | ||
793 | default: | |
794 | return -EINVAL; | |
795 | } | |
796 | ||
797 | if (!ops->send_attr || | |
798 | !ops->handle_attr || | |
799 | !ops->handshake_complete) | |
800 | return -EINVAL; | |
801 | ||
e53e97ce DM |
802 | if (!ver_table || ver_table_size < 0) |
803 | return -EINVAL; | |
804 | ||
805 | if (!name) | |
806 | return -EINVAL; | |
807 | ||
808 | spin_lock_init(&vio->lock); | |
809 | ||
810 | vio->name = name; | |
811 | ||
812 | vio->dev_class = dev_class; | |
813 | vio->vdev = vdev; | |
814 | ||
e53e97ce DM |
815 | vio->ver_table = ver_table; |
816 | vio->ver_table_entries = ver_table_size; | |
817 | ||
818 | vio->ops = ops; | |
819 | ||
820 | setup_timer(&vio->timer, vio_port_timer, (unsigned long) vio); | |
821 | ||
822 | return 0; | |
823 | } | |
824 | EXPORT_SYMBOL(vio_driver_init); |