Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
e53e97ce DM |
2 | /* viohs.c: LDOM Virtual I/O handshake helper layer. |
3 | * | |
4 | * Copyright (C) 2007 David S. Miller <davem@davemloft.net> | |
5 | */ | |
6 | ||
7 | #include <linux/kernel.h> | |
066bcaca | 8 | #include <linux/export.h> |
e53e97ce DM |
9 | #include <linux/string.h> |
10 | #include <linux/delay.h> | |
11 | #include <linux/sched.h> | |
e6017571 | 12 | #include <linux/sched/clock.h> |
e53e97ce DM |
13 | #include <linux/slab.h> |
14 | ||
15 | #include <asm/ldc.h> | |
16 | #include <asm/vio.h> | |
17 | ||
18 | int vio_ldc_send(struct vio_driver_state *vio, void *data, int len) | |
19 | { | |
20 | int err, limit = 1000; | |
21 | ||
22 | err = -EINVAL; | |
23 | while (limit-- > 0) { | |
24 | err = ldc_write(vio->lp, data, len); | |
25 | if (!err || (err != -EAGAIN)) | |
26 | break; | |
27 | udelay(1); | |
28 | } | |
29 | ||
30 | return err; | |
31 | } | |
32 | EXPORT_SYMBOL(vio_ldc_send); | |
33 | ||
34 | static int send_ctrl(struct vio_driver_state *vio, | |
35 | struct vio_msg_tag *tag, int len) | |
36 | { | |
37 | tag->sid = vio_send_sid(vio); | |
38 | return vio_ldc_send(vio, tag, len); | |
39 | } | |
40 | ||
41 | static void init_tag(struct vio_msg_tag *tag, u8 type, u8 stype, u16 stype_env) | |
42 | { | |
43 | tag->type = type; | |
44 | tag->stype = stype; | |
45 | tag->stype_env = stype_env; | |
46 | } | |
47 | ||
48 | static int send_version(struct vio_driver_state *vio, u16 major, u16 minor) | |
49 | { | |
50 | struct vio_ver_info pkt; | |
51 | ||
52 | vio->_local_sid = (u32) sched_clock(); | |
53 | ||
54 | memset(&pkt, 0, sizeof(pkt)); | |
55 | init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_VER_INFO); | |
56 | pkt.major = major; | |
57 | pkt.minor = minor; | |
58 | pkt.dev_class = vio->dev_class; | |
59 | ||
60 | viodbg(HS, "SEND VERSION INFO maj[%u] min[%u] devclass[%u]\n", | |
61 | major, minor, vio->dev_class); | |
62 | ||
63 | return send_ctrl(vio, &pkt.tag, sizeof(pkt)); | |
64 | } | |
65 | ||
66 | static int start_handshake(struct vio_driver_state *vio) | |
67 | { | |
68 | int err; | |
69 | ||
70 | viodbg(HS, "START HANDSHAKE\n"); | |
71 | ||
72 | vio->hs_state = VIO_HS_INVALID; | |
73 | ||
74 | err = send_version(vio, | |
75 | vio->ver_table[0].major, | |
76 | vio->ver_table[0].minor); | |
77 | if (err < 0) | |
78 | return err; | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
a4cd1845 DM |
83 | static void flush_rx_dring(struct vio_driver_state *vio) |
84 | { | |
85 | struct vio_dring_state *dr; | |
86 | u64 ident; | |
87 | ||
88 | BUG_ON(!(vio->dr_state & VIO_DR_STATE_RXREG)); | |
89 | ||
90 | dr = &vio->drings[VIO_DRIVER_RX_RING]; | |
91 | ident = dr->ident; | |
92 | ||
93 | BUG_ON(!vio->desc_buf); | |
94 | kfree(vio->desc_buf); | |
a5f8967e | 95 | vio->desc_buf = NULL; |
a4cd1845 DM |
96 | |
97 | memset(dr, 0, sizeof(*dr)); | |
98 | dr->ident = ident; | |
99 | } | |
100 | ||
e53e97ce DM |
101 | void vio_link_state_change(struct vio_driver_state *vio, int event) |
102 | { | |
103 | if (event == LDC_EVENT_UP) { | |
104 | vio->hs_state = VIO_HS_INVALID; | |
105 | ||
106 | switch (vio->dev_class) { | |
107 | case VDEV_NETWORK: | |
108 | case VDEV_NETWORK_SWITCH: | |
109 | vio->dr_state = (VIO_DR_STATE_TXREQ | | |
110 | VIO_DR_STATE_RXREQ); | |
111 | break; | |
112 | ||
113 | case VDEV_DISK: | |
114 | vio->dr_state = VIO_DR_STATE_TXREQ; | |
115 | break; | |
116 | case VDEV_DISK_SERVER: | |
117 | vio->dr_state = VIO_DR_STATE_RXREQ; | |
118 | break; | |
119 | } | |
120 | start_handshake(vio); | |
a4cd1845 DM |
121 | } else if (event == LDC_EVENT_RESET) { |
122 | vio->hs_state = VIO_HS_INVALID; | |
123 | ||
124 | if (vio->dr_state & VIO_DR_STATE_RXREG) | |
125 | flush_rx_dring(vio); | |
126 | ||
127 | vio->dr_state = 0x00; | |
128 | memset(&vio->ver, 0, sizeof(vio->ver)); | |
129 | ||
130 | ldc_disconnect(vio->lp); | |
e53e97ce DM |
131 | } |
132 | } | |
133 | EXPORT_SYMBOL(vio_link_state_change); | |
134 | ||
135 | static int handshake_failure(struct vio_driver_state *vio) | |
136 | { | |
137 | struct vio_dring_state *dr; | |
138 | ||
139 | /* XXX Put policy here... Perhaps start a timer to fire | |
140 | * XXX in 100 ms, which will bring the link up and retry | |
141 | * XXX the handshake. | |
142 | */ | |
143 | ||
144 | viodbg(HS, "HANDSHAKE FAILURE\n"); | |
145 | ||
146 | vio->dr_state &= ~(VIO_DR_STATE_TXREG | | |
147 | VIO_DR_STATE_RXREG); | |
148 | ||
149 | dr = &vio->drings[VIO_DRIVER_RX_RING]; | |
150 | memset(dr, 0, sizeof(*dr)); | |
151 | ||
152 | kfree(vio->desc_buf); | |
153 | vio->desc_buf = NULL; | |
154 | vio->desc_buf_len = 0; | |
155 | ||
156 | vio->hs_state = VIO_HS_INVALID; | |
157 | ||
158 | return -ECONNRESET; | |
159 | } | |
160 | ||
161 | static int process_unknown(struct vio_driver_state *vio, void *arg) | |
162 | { | |
163 | struct vio_msg_tag *pkt = arg; | |
164 | ||
165 | viodbg(HS, "UNKNOWN CONTROL [%02x:%02x:%04x:%08x]\n", | |
166 | pkt->type, pkt->stype, pkt->stype_env, pkt->sid); | |
167 | ||
168 | printk(KERN_ERR "vio: ID[%lu] Resetting connection.\n", | |
43fdf274 | 169 | vio->vdev->channel_id); |
e53e97ce DM |
170 | |
171 | ldc_disconnect(vio->lp); | |
172 | ||
173 | return -ECONNRESET; | |
174 | } | |
175 | ||
176 | static int send_dreg(struct vio_driver_state *vio) | |
177 | { | |
178 | struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_TX_RING]; | |
179 | union { | |
180 | struct vio_dring_register pkt; | |
181 | char all[sizeof(struct vio_dring_register) + | |
182 | (sizeof(struct ldc_trans_cookie) * | |
31a43fa7 | 183 | VIO_MAX_RING_COOKIES)]; |
e53e97ce | 184 | } u; |
31a43fa7 KC |
185 | size_t bytes = sizeof(struct vio_dring_register) + |
186 | (sizeof(struct ldc_trans_cookie) * | |
187 | dr->ncookies); | |
e53e97ce DM |
188 | int i; |
189 | ||
31a43fa7 KC |
190 | if (WARN_ON(bytes > sizeof(u))) |
191 | return -EINVAL; | |
192 | ||
193 | memset(&u, 0, bytes); | |
e53e97ce DM |
194 | init_tag(&u.pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_DRING_REG); |
195 | u.pkt.dring_ident = 0; | |
196 | u.pkt.num_descr = dr->num_entries; | |
197 | u.pkt.descr_size = dr->entry_size; | |
198 | u.pkt.options = VIO_TX_DRING; | |
199 | u.pkt.num_cookies = dr->ncookies; | |
200 | ||
201 | viodbg(HS, "SEND DRING_REG INFO ndesc[%u] dsz[%u] opt[0x%x] " | |
202 | "ncookies[%u]\n", | |
203 | u.pkt.num_descr, u.pkt.descr_size, u.pkt.options, | |
204 | u.pkt.num_cookies); | |
205 | ||
206 | for (i = 0; i < dr->ncookies; i++) { | |
207 | u.pkt.cookies[i] = dr->cookies[i]; | |
208 | ||
209 | viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n", | |
210 | i, | |
211 | (unsigned long long) u.pkt.cookies[i].cookie_addr, | |
212 | (unsigned long long) u.pkt.cookies[i].cookie_size); | |
213 | } | |
214 | ||
31a43fa7 | 215 | return send_ctrl(vio, &u.pkt.tag, bytes); |
e53e97ce DM |
216 | } |
217 | ||
218 | static int send_rdx(struct vio_driver_state *vio) | |
219 | { | |
220 | struct vio_rdx pkt; | |
221 | ||
222 | memset(&pkt, 0, sizeof(pkt)); | |
223 | ||
224 | init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_RDX); | |
225 | ||
226 | viodbg(HS, "SEND RDX INFO\n"); | |
227 | ||
228 | return send_ctrl(vio, &pkt.tag, sizeof(pkt)); | |
229 | } | |
230 | ||
231 | static int send_attr(struct vio_driver_state *vio) | |
232 | { | |
7b6e04a3 JR |
233 | if (!vio->ops) |
234 | return -EINVAL; | |
235 | ||
e53e97ce DM |
236 | return vio->ops->send_attr(vio); |
237 | } | |
238 | ||
239 | static struct vio_version *find_by_major(struct vio_driver_state *vio, | |
240 | u16 major) | |
241 | { | |
242 | struct vio_version *ret = NULL; | |
243 | int i; | |
244 | ||
245 | for (i = 0; i < vio->ver_table_entries; i++) { | |
246 | struct vio_version *v = &vio->ver_table[i]; | |
247 | if (v->major <= major) { | |
248 | ret = v; | |
249 | break; | |
250 | } | |
251 | } | |
252 | return ret; | |
253 | } | |
254 | ||
255 | static int process_ver_info(struct vio_driver_state *vio, | |
256 | struct vio_ver_info *pkt) | |
257 | { | |
258 | struct vio_version *vap; | |
259 | int err; | |
260 | ||
261 | viodbg(HS, "GOT VERSION INFO maj[%u] min[%u] devclass[%u]\n", | |
262 | pkt->major, pkt->minor, pkt->dev_class); | |
263 | ||
264 | if (vio->hs_state != VIO_HS_INVALID) { | |
265 | /* XXX Perhaps invoke start_handshake? XXX */ | |
266 | memset(&vio->ver, 0, sizeof(vio->ver)); | |
267 | vio->hs_state = VIO_HS_INVALID; | |
268 | } | |
269 | ||
270 | vap = find_by_major(vio, pkt->major); | |
271 | ||
272 | vio->_peer_sid = pkt->tag.sid; | |
273 | ||
274 | if (!vap) { | |
275 | pkt->tag.stype = VIO_SUBTYPE_NACK; | |
276 | pkt->major = 0; | |
277 | pkt->minor = 0; | |
278 | viodbg(HS, "SEND VERSION NACK maj[0] min[0]\n"); | |
279 | err = send_ctrl(vio, &pkt->tag, sizeof(*pkt)); | |
280 | } else if (vap->major != pkt->major) { | |
281 | pkt->tag.stype = VIO_SUBTYPE_NACK; | |
282 | pkt->major = vap->major; | |
283 | pkt->minor = vap->minor; | |
284 | viodbg(HS, "SEND VERSION NACK maj[%u] min[%u]\n", | |
285 | pkt->major, pkt->minor); | |
286 | err = send_ctrl(vio, &pkt->tag, sizeof(*pkt)); | |
287 | } else { | |
288 | struct vio_version ver = { | |
289 | .major = pkt->major, | |
290 | .minor = pkt->minor, | |
291 | }; | |
292 | if (ver.minor > vap->minor) | |
293 | ver.minor = vap->minor; | |
294 | pkt->minor = ver.minor; | |
295 | pkt->tag.stype = VIO_SUBTYPE_ACK; | |
ac6bb025 | 296 | pkt->dev_class = vio->dev_class; |
e53e97ce DM |
297 | viodbg(HS, "SEND VERSION ACK maj[%u] min[%u]\n", |
298 | pkt->major, pkt->minor); | |
299 | err = send_ctrl(vio, &pkt->tag, sizeof(*pkt)); | |
300 | if (err > 0) { | |
301 | vio->ver = ver; | |
302 | vio->hs_state = VIO_HS_GOTVERS; | |
303 | } | |
304 | } | |
305 | if (err < 0) | |
306 | return handshake_failure(vio); | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
311 | static int process_ver_ack(struct vio_driver_state *vio, | |
312 | struct vio_ver_info *pkt) | |
313 | { | |
314 | viodbg(HS, "GOT VERSION ACK maj[%u] min[%u] devclass[%u]\n", | |
315 | pkt->major, pkt->minor, pkt->dev_class); | |
316 | ||
317 | if (vio->hs_state & VIO_HS_GOTVERS) { | |
318 | if (vio->ver.major != pkt->major || | |
319 | vio->ver.minor != pkt->minor) { | |
320 | pkt->tag.stype = VIO_SUBTYPE_NACK; | |
321 | (void) send_ctrl(vio, &pkt->tag, sizeof(*pkt)); | |
322 | return handshake_failure(vio); | |
323 | } | |
324 | } else { | |
325 | vio->ver.major = pkt->major; | |
326 | vio->ver.minor = pkt->minor; | |
327 | vio->hs_state = VIO_HS_GOTVERS; | |
328 | } | |
329 | ||
330 | switch (vio->dev_class) { | |
331 | case VDEV_NETWORK: | |
332 | case VDEV_DISK: | |
333 | if (send_attr(vio) < 0) | |
334 | return handshake_failure(vio); | |
335 | break; | |
336 | ||
337 | default: | |
338 | break; | |
339 | } | |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
344 | static int process_ver_nack(struct vio_driver_state *vio, | |
345 | struct vio_ver_info *pkt) | |
346 | { | |
347 | struct vio_version *nver; | |
348 | ||
349 | viodbg(HS, "GOT VERSION NACK maj[%u] min[%u] devclass[%u]\n", | |
350 | pkt->major, pkt->minor, pkt->dev_class); | |
351 | ||
2eac5a0d SR |
352 | if (pkt->major == 0 && pkt->minor == 0) |
353 | return handshake_failure(vio); | |
354 | nver = find_by_major(vio, pkt->major); | |
355 | if (!nver) | |
e53e97ce DM |
356 | return handshake_failure(vio); |
357 | ||
358 | if (send_version(vio, nver->major, nver->minor) < 0) | |
359 | return handshake_failure(vio); | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
364 | static int process_ver(struct vio_driver_state *vio, struct vio_ver_info *pkt) | |
365 | { | |
366 | switch (pkt->tag.stype) { | |
367 | case VIO_SUBTYPE_INFO: | |
368 | return process_ver_info(vio, pkt); | |
369 | ||
370 | case VIO_SUBTYPE_ACK: | |
371 | return process_ver_ack(vio, pkt); | |
372 | ||
373 | case VIO_SUBTYPE_NACK: | |
374 | return process_ver_nack(vio, pkt); | |
375 | ||
376 | default: | |
377 | return handshake_failure(vio); | |
6cb79b3f | 378 | } |
e53e97ce DM |
379 | } |
380 | ||
381 | static int process_attr(struct vio_driver_state *vio, void *pkt) | |
382 | { | |
383 | int err; | |
384 | ||
385 | if (!(vio->hs_state & VIO_HS_GOTVERS)) | |
386 | return handshake_failure(vio); | |
387 | ||
7b6e04a3 JR |
388 | if (!vio->ops) |
389 | return 0; | |
390 | ||
e53e97ce DM |
391 | err = vio->ops->handle_attr(vio, pkt); |
392 | if (err < 0) { | |
393 | return handshake_failure(vio); | |
394 | } else { | |
395 | vio->hs_state |= VIO_HS_GOT_ATTR; | |
396 | ||
397 | if ((vio->dr_state & VIO_DR_STATE_TXREQ) && | |
398 | !(vio->hs_state & VIO_HS_SENT_DREG)) { | |
399 | if (send_dreg(vio) < 0) | |
400 | return handshake_failure(vio); | |
401 | ||
402 | vio->hs_state |= VIO_HS_SENT_DREG; | |
403 | } | |
404 | } | |
7b6e04a3 | 405 | |
e53e97ce DM |
406 | return 0; |
407 | } | |
408 | ||
409 | static int all_drings_registered(struct vio_driver_state *vio) | |
410 | { | |
411 | int need_rx, need_tx; | |
412 | ||
413 | need_rx = (vio->dr_state & VIO_DR_STATE_RXREQ); | |
414 | need_tx = (vio->dr_state & VIO_DR_STATE_TXREQ); | |
415 | ||
416 | if (need_rx && | |
417 | !(vio->dr_state & VIO_DR_STATE_RXREG)) | |
418 | return 0; | |
419 | ||
420 | if (need_tx && | |
421 | !(vio->dr_state & VIO_DR_STATE_TXREG)) | |
422 | return 0; | |
423 | ||
424 | return 1; | |
425 | } | |
426 | ||
427 | static int process_dreg_info(struct vio_driver_state *vio, | |
428 | struct vio_dring_register *pkt) | |
429 | { | |
430 | struct vio_dring_state *dr; | |
c05d042f | 431 | int i; |
e53e97ce DM |
432 | |
433 | viodbg(HS, "GOT DRING_REG INFO ident[%llx] " | |
434 | "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n", | |
435 | (unsigned long long) pkt->dring_ident, | |
436 | pkt->num_descr, pkt->descr_size, pkt->options, | |
437 | pkt->num_cookies); | |
438 | ||
439 | if (!(vio->dr_state & VIO_DR_STATE_RXREQ)) | |
440 | goto send_nack; | |
441 | ||
442 | if (vio->dr_state & VIO_DR_STATE_RXREG) | |
443 | goto send_nack; | |
444 | ||
163a4e74 DS |
445 | /* v1.6 and higher, ACK with desired, supported mode, or NACK */ |
446 | if (vio_version_after_eq(vio, 1, 6)) { | |
447 | if (!(pkt->options & VIO_TX_DRING)) | |
448 | goto send_nack; | |
449 | pkt->options = VIO_TX_DRING; | |
450 | } | |
451 | ||
a4cd1845 DM |
452 | BUG_ON(vio->desc_buf); |
453 | ||
e53e97ce DM |
454 | vio->desc_buf = kzalloc(pkt->descr_size, GFP_ATOMIC); |
455 | if (!vio->desc_buf) | |
456 | goto send_nack; | |
457 | ||
458 | vio->desc_buf_len = pkt->descr_size; | |
459 | ||
460 | dr = &vio->drings[VIO_DRIVER_RX_RING]; | |
461 | ||
462 | dr->num_entries = pkt->num_descr; | |
463 | dr->entry_size = pkt->descr_size; | |
464 | dr->ncookies = pkt->num_cookies; | |
465 | for (i = 0; i < dr->ncookies; i++) { | |
466 | dr->cookies[i] = pkt->cookies[i]; | |
467 | ||
468 | viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n", | |
469 | i, | |
470 | (unsigned long long) | |
471 | pkt->cookies[i].cookie_addr, | |
472 | (unsigned long long) | |
473 | pkt->cookies[i].cookie_size); | |
474 | } | |
475 | ||
476 | pkt->tag.stype = VIO_SUBTYPE_ACK; | |
477 | pkt->dring_ident = ++dr->ident; | |
478 | ||
163a4e74 DS |
479 | viodbg(HS, "SEND DRING_REG ACK ident[%llx] " |
480 | "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n", | |
481 | (unsigned long long) pkt->dring_ident, | |
482 | pkt->num_descr, pkt->descr_size, pkt->options, | |
483 | pkt->num_cookies); | |
e53e97ce | 484 | |
c05d042f | 485 | if (send_ctrl(vio, &pkt->tag, struct_size(pkt, cookies, dr->ncookies)) < 0) |
e53e97ce DM |
486 | goto send_nack; |
487 | ||
488 | vio->dr_state |= VIO_DR_STATE_RXREG; | |
489 | ||
490 | return 0; | |
491 | ||
492 | send_nack: | |
493 | pkt->tag.stype = VIO_SUBTYPE_NACK; | |
494 | viodbg(HS, "SEND DRING_REG NACK\n"); | |
495 | (void) send_ctrl(vio, &pkt->tag, sizeof(*pkt)); | |
496 | ||
497 | return handshake_failure(vio); | |
498 | } | |
499 | ||
500 | static int process_dreg_ack(struct vio_driver_state *vio, | |
501 | struct vio_dring_register *pkt) | |
502 | { | |
503 | struct vio_dring_state *dr; | |
504 | ||
505 | viodbg(HS, "GOT DRING_REG ACK ident[%llx] " | |
506 | "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n", | |
507 | (unsigned long long) pkt->dring_ident, | |
508 | pkt->num_descr, pkt->descr_size, pkt->options, | |
509 | pkt->num_cookies); | |
510 | ||
511 | dr = &vio->drings[VIO_DRIVER_TX_RING]; | |
512 | ||
513 | if (!(vio->dr_state & VIO_DR_STATE_TXREQ)) | |
514 | return handshake_failure(vio); | |
515 | ||
516 | dr->ident = pkt->dring_ident; | |
517 | vio->dr_state |= VIO_DR_STATE_TXREG; | |
518 | ||
519 | if (all_drings_registered(vio)) { | |
520 | if (send_rdx(vio) < 0) | |
521 | return handshake_failure(vio); | |
522 | vio->hs_state = VIO_HS_SENT_RDX; | |
523 | } | |
524 | return 0; | |
525 | } | |
526 | ||
527 | static int process_dreg_nack(struct vio_driver_state *vio, | |
528 | struct vio_dring_register *pkt) | |
529 | { | |
530 | viodbg(HS, "GOT DRING_REG NACK ident[%llx] " | |
531 | "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n", | |
532 | (unsigned long long) pkt->dring_ident, | |
533 | pkt->num_descr, pkt->descr_size, pkt->options, | |
534 | pkt->num_cookies); | |
535 | ||
536 | return handshake_failure(vio); | |
537 | } | |
538 | ||
539 | static int process_dreg(struct vio_driver_state *vio, | |
540 | struct vio_dring_register *pkt) | |
541 | { | |
542 | if (!(vio->hs_state & VIO_HS_GOTVERS)) | |
543 | return handshake_failure(vio); | |
544 | ||
545 | switch (pkt->tag.stype) { | |
546 | case VIO_SUBTYPE_INFO: | |
547 | return process_dreg_info(vio, pkt); | |
548 | ||
549 | case VIO_SUBTYPE_ACK: | |
550 | return process_dreg_ack(vio, pkt); | |
551 | ||
552 | case VIO_SUBTYPE_NACK: | |
553 | return process_dreg_nack(vio, pkt); | |
554 | ||
555 | default: | |
556 | return handshake_failure(vio); | |
557 | } | |
558 | } | |
559 | ||
560 | static int process_dunreg(struct vio_driver_state *vio, | |
561 | struct vio_dring_unregister *pkt) | |
562 | { | |
563 | struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_RX_RING]; | |
564 | ||
565 | viodbg(HS, "GOT DRING_UNREG\n"); | |
566 | ||
567 | if (pkt->dring_ident != dr->ident) | |
568 | return 0; | |
569 | ||
570 | vio->dr_state &= ~VIO_DR_STATE_RXREG; | |
571 | ||
572 | memset(dr, 0, sizeof(*dr)); | |
573 | ||
574 | kfree(vio->desc_buf); | |
575 | vio->desc_buf = NULL; | |
576 | vio->desc_buf_len = 0; | |
577 | ||
578 | return 0; | |
579 | } | |
580 | ||
581 | static int process_rdx_info(struct vio_driver_state *vio, struct vio_rdx *pkt) | |
582 | { | |
583 | viodbg(HS, "GOT RDX INFO\n"); | |
584 | ||
585 | pkt->tag.stype = VIO_SUBTYPE_ACK; | |
586 | viodbg(HS, "SEND RDX ACK\n"); | |
587 | if (send_ctrl(vio, &pkt->tag, sizeof(*pkt)) < 0) | |
588 | return handshake_failure(vio); | |
589 | ||
590 | vio->hs_state |= VIO_HS_SENT_RDX_ACK; | |
591 | return 0; | |
592 | } | |
593 | ||
594 | static int process_rdx_ack(struct vio_driver_state *vio, struct vio_rdx *pkt) | |
595 | { | |
596 | viodbg(HS, "GOT RDX ACK\n"); | |
597 | ||
598 | if (!(vio->hs_state & VIO_HS_SENT_RDX)) | |
599 | return handshake_failure(vio); | |
600 | ||
601 | vio->hs_state |= VIO_HS_GOT_RDX_ACK; | |
602 | return 0; | |
603 | } | |
604 | ||
605 | static int process_rdx_nack(struct vio_driver_state *vio, struct vio_rdx *pkt) | |
606 | { | |
607 | viodbg(HS, "GOT RDX NACK\n"); | |
608 | ||
609 | return handshake_failure(vio); | |
610 | } | |
611 | ||
612 | static int process_rdx(struct vio_driver_state *vio, struct vio_rdx *pkt) | |
613 | { | |
614 | if (!all_drings_registered(vio)) | |
615 | handshake_failure(vio); | |
616 | ||
617 | switch (pkt->tag.stype) { | |
618 | case VIO_SUBTYPE_INFO: | |
619 | return process_rdx_info(vio, pkt); | |
620 | ||
621 | case VIO_SUBTYPE_ACK: | |
622 | return process_rdx_ack(vio, pkt); | |
623 | ||
624 | case VIO_SUBTYPE_NACK: | |
625 | return process_rdx_nack(vio, pkt); | |
626 | ||
627 | default: | |
628 | return handshake_failure(vio); | |
629 | } | |
630 | } | |
631 | ||
632 | int vio_control_pkt_engine(struct vio_driver_state *vio, void *pkt) | |
633 | { | |
634 | struct vio_msg_tag *tag = pkt; | |
635 | u8 prev_state = vio->hs_state; | |
636 | int err; | |
637 | ||
638 | switch (tag->stype_env) { | |
639 | case VIO_VER_INFO: | |
640 | err = process_ver(vio, pkt); | |
641 | break; | |
642 | ||
643 | case VIO_ATTR_INFO: | |
644 | err = process_attr(vio, pkt); | |
645 | break; | |
646 | ||
647 | case VIO_DRING_REG: | |
648 | err = process_dreg(vio, pkt); | |
649 | break; | |
650 | ||
651 | case VIO_DRING_UNREG: | |
652 | err = process_dunreg(vio, pkt); | |
653 | break; | |
654 | ||
655 | case VIO_RDX: | |
656 | err = process_rdx(vio, pkt); | |
657 | break; | |
658 | ||
659 | default: | |
660 | err = process_unknown(vio, pkt); | |
661 | break; | |
662 | } | |
7b6e04a3 | 663 | |
e53e97ce DM |
664 | if (!err && |
665 | vio->hs_state != prev_state && | |
7b6e04a3 JR |
666 | (vio->hs_state & VIO_HS_COMPLETE)) { |
667 | if (vio->ops) | |
668 | vio->ops->handshake_complete(vio); | |
669 | } | |
e53e97ce DM |
670 | |
671 | return err; | |
672 | } | |
673 | EXPORT_SYMBOL(vio_control_pkt_engine); | |
674 | ||
675 | void vio_conn_reset(struct vio_driver_state *vio) | |
676 | { | |
677 | } | |
678 | EXPORT_SYMBOL(vio_conn_reset); | |
679 | ||
680 | /* The issue is that the Solaris virtual disk server just mirrors the | |
681 | * SID values it gets from the client peer. So we work around that | |
682 | * here in vio_{validate,send}_sid() so that the drivers don't need | |
683 | * to be aware of this crap. | |
684 | */ | |
685 | int vio_validate_sid(struct vio_driver_state *vio, struct vio_msg_tag *tp) | |
686 | { | |
687 | u32 sid; | |
688 | ||
689 | /* Always let VERSION+INFO packets through unchecked, they | |
690 | * define the new SID. | |
691 | */ | |
692 | if (tp->type == VIO_TYPE_CTRL && | |
693 | tp->stype == VIO_SUBTYPE_INFO && | |
694 | tp->stype_env == VIO_VER_INFO) | |
695 | return 0; | |
696 | ||
697 | /* Ok, now figure out which SID to use. */ | |
698 | switch (vio->dev_class) { | |
699 | case VDEV_NETWORK: | |
700 | case VDEV_NETWORK_SWITCH: | |
701 | case VDEV_DISK_SERVER: | |
702 | default: | |
703 | sid = vio->_peer_sid; | |
704 | break; | |
705 | ||
706 | case VDEV_DISK: | |
707 | sid = vio->_local_sid; | |
708 | break; | |
709 | } | |
710 | ||
711 | if (sid == tp->sid) | |
712 | return 0; | |
713 | viodbg(DATA, "BAD SID tag->sid[%08x] peer_sid[%08x] local_sid[%08x]\n", | |
714 | tp->sid, vio->_peer_sid, vio->_local_sid); | |
715 | return -EINVAL; | |
716 | } | |
717 | EXPORT_SYMBOL(vio_validate_sid); | |
718 | ||
719 | u32 vio_send_sid(struct vio_driver_state *vio) | |
720 | { | |
721 | switch (vio->dev_class) { | |
722 | case VDEV_NETWORK: | |
723 | case VDEV_NETWORK_SWITCH: | |
724 | case VDEV_DISK: | |
725 | default: | |
726 | return vio->_local_sid; | |
727 | ||
728 | case VDEV_DISK_SERVER: | |
729 | return vio->_peer_sid; | |
730 | } | |
731 | } | |
732 | EXPORT_SYMBOL(vio_send_sid); | |
733 | ||
55fe9771 | 734 | int vio_ldc_alloc(struct vio_driver_state *vio, |
e53e97ce DM |
735 | struct ldc_channel_config *base_cfg, |
736 | void *event_arg) | |
737 | { | |
738 | struct ldc_channel_config cfg = *base_cfg; | |
739 | struct ldc_channel *lp; | |
e53e97ce | 740 | |
43fdf274 DM |
741 | cfg.tx_irq = vio->vdev->tx_irq; |
742 | cfg.rx_irq = vio->vdev->rx_irq; | |
e53e97ce | 743 | |
c21c4ab0 | 744 | lp = ldc_alloc(vio->vdev->channel_id, &cfg, event_arg, vio->name); |
e53e97ce DM |
745 | if (IS_ERR(lp)) |
746 | return PTR_ERR(lp); | |
747 | ||
748 | vio->lp = lp; | |
749 | ||
750 | return 0; | |
751 | } | |
752 | EXPORT_SYMBOL(vio_ldc_alloc); | |
753 | ||
754 | void vio_ldc_free(struct vio_driver_state *vio) | |
755 | { | |
756 | ldc_free(vio->lp); | |
757 | vio->lp = NULL; | |
758 | ||
759 | kfree(vio->desc_buf); | |
760 | vio->desc_buf = NULL; | |
761 | vio->desc_buf_len = 0; | |
762 | } | |
763 | EXPORT_SYMBOL(vio_ldc_free); | |
764 | ||
765 | void vio_port_up(struct vio_driver_state *vio) | |
766 | { | |
767 | unsigned long flags; | |
768 | int err, state; | |
769 | ||
770 | spin_lock_irqsave(&vio->lock, flags); | |
771 | ||
772 | state = ldc_state(vio->lp); | |
773 | ||
774 | err = 0; | |
775 | if (state == LDC_STATE_INIT) { | |
c21c4ab0 | 776 | err = ldc_bind(vio->lp); |
e53e97ce DM |
777 | if (err) |
778 | printk(KERN_WARNING "%s: Port %lu bind failed, " | |
779 | "err=%d\n", | |
43fdf274 | 780 | vio->name, vio->vdev->channel_id, err); |
e53e97ce DM |
781 | } |
782 | ||
783 | if (!err) { | |
01b7a471 JR |
784 | if (ldc_mode(vio->lp) == LDC_MODE_RAW) |
785 | ldc_set_state(vio->lp, LDC_STATE_CONNECTED); | |
786 | else | |
787 | err = ldc_connect(vio->lp); | |
788 | ||
e53e97ce DM |
789 | if (err) |
790 | printk(KERN_WARNING "%s: Port %lu connect failed, " | |
791 | "err=%d\n", | |
43fdf274 | 792 | vio->name, vio->vdev->channel_id, err); |
e53e97ce DM |
793 | } |
794 | if (err) { | |
795 | unsigned long expires = jiffies + HZ; | |
796 | ||
797 | expires = round_jiffies(expires); | |
798 | mod_timer(&vio->timer, expires); | |
799 | } | |
800 | ||
801 | spin_unlock_irqrestore(&vio->lock, flags); | |
802 | } | |
803 | EXPORT_SYMBOL(vio_port_up); | |
804 | ||
ff029687 | 805 | static void vio_port_timer(struct timer_list *t) |
e53e97ce | 806 | { |
ff029687 | 807 | struct vio_driver_state *vio = from_timer(vio, t, timer); |
e53e97ce DM |
808 | |
809 | vio_port_up(vio); | |
810 | } | |
811 | ||
812 | int vio_driver_init(struct vio_driver_state *vio, struct vio_dev *vdev, | |
43fdf274 DM |
813 | u8 dev_class, struct vio_version *ver_table, |
814 | int ver_table_size, struct vio_driver_ops *ops, | |
815 | char *name) | |
e53e97ce DM |
816 | { |
817 | switch (dev_class) { | |
818 | case VDEV_NETWORK: | |
819 | case VDEV_NETWORK_SWITCH: | |
820 | case VDEV_DISK: | |
821 | case VDEV_DISK_SERVER: | |
5d171050 | 822 | case VDEV_CONSOLE_CON: |
e53e97ce DM |
823 | break; |
824 | ||
825 | default: | |
826 | return -EINVAL; | |
827 | } | |
828 | ||
5d171050 JR |
829 | if (dev_class == VDEV_NETWORK || |
830 | dev_class == VDEV_NETWORK_SWITCH || | |
831 | dev_class == VDEV_DISK || | |
832 | dev_class == VDEV_DISK_SERVER) { | |
833 | if (!ops || !ops->send_attr || !ops->handle_attr || | |
834 | !ops->handshake_complete) | |
835 | return -EINVAL; | |
836 | } | |
e53e97ce | 837 | |
e53e97ce DM |
838 | if (!ver_table || ver_table_size < 0) |
839 | return -EINVAL; | |
840 | ||
841 | if (!name) | |
842 | return -EINVAL; | |
843 | ||
844 | spin_lock_init(&vio->lock); | |
845 | ||
846 | vio->name = name; | |
847 | ||
848 | vio->dev_class = dev_class; | |
849 | vio->vdev = vdev; | |
850 | ||
e53e97ce DM |
851 | vio->ver_table = ver_table; |
852 | vio->ver_table_entries = ver_table_size; | |
853 | ||
854 | vio->ops = ops; | |
855 | ||
ff029687 | 856 | timer_setup(&vio->timer, vio_port_timer, 0); |
e53e97ce DM |
857 | |
858 | return 0; | |
859 | } | |
860 | EXPORT_SYMBOL(vio_driver_init); |