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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; | |
431 | int i, len; | |
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 DM |
484 | |
485 | len = (sizeof(*pkt) + | |
486 | (dr->ncookies * sizeof(struct ldc_trans_cookie))); | |
487 | if (send_ctrl(vio, &pkt->tag, len) < 0) | |
488 | goto send_nack; | |
489 | ||
490 | vio->dr_state |= VIO_DR_STATE_RXREG; | |
491 | ||
492 | return 0; | |
493 | ||
494 | send_nack: | |
495 | pkt->tag.stype = VIO_SUBTYPE_NACK; | |
496 | viodbg(HS, "SEND DRING_REG NACK\n"); | |
497 | (void) send_ctrl(vio, &pkt->tag, sizeof(*pkt)); | |
498 | ||
499 | return handshake_failure(vio); | |
500 | } | |
501 | ||
502 | static int process_dreg_ack(struct vio_driver_state *vio, | |
503 | struct vio_dring_register *pkt) | |
504 | { | |
505 | struct vio_dring_state *dr; | |
506 | ||
507 | viodbg(HS, "GOT DRING_REG ACK ident[%llx] " | |
508 | "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n", | |
509 | (unsigned long long) pkt->dring_ident, | |
510 | pkt->num_descr, pkt->descr_size, pkt->options, | |
511 | pkt->num_cookies); | |
512 | ||
513 | dr = &vio->drings[VIO_DRIVER_TX_RING]; | |
514 | ||
515 | if (!(vio->dr_state & VIO_DR_STATE_TXREQ)) | |
516 | return handshake_failure(vio); | |
517 | ||
518 | dr->ident = pkt->dring_ident; | |
519 | vio->dr_state |= VIO_DR_STATE_TXREG; | |
520 | ||
521 | if (all_drings_registered(vio)) { | |
522 | if (send_rdx(vio) < 0) | |
523 | return handshake_failure(vio); | |
524 | vio->hs_state = VIO_HS_SENT_RDX; | |
525 | } | |
526 | return 0; | |
527 | } | |
528 | ||
529 | static int process_dreg_nack(struct vio_driver_state *vio, | |
530 | struct vio_dring_register *pkt) | |
531 | { | |
532 | viodbg(HS, "GOT DRING_REG NACK ident[%llx] " | |
533 | "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n", | |
534 | (unsigned long long) pkt->dring_ident, | |
535 | pkt->num_descr, pkt->descr_size, pkt->options, | |
536 | pkt->num_cookies); | |
537 | ||
538 | return handshake_failure(vio); | |
539 | } | |
540 | ||
541 | static int process_dreg(struct vio_driver_state *vio, | |
542 | struct vio_dring_register *pkt) | |
543 | { | |
544 | if (!(vio->hs_state & VIO_HS_GOTVERS)) | |
545 | return handshake_failure(vio); | |
546 | ||
547 | switch (pkt->tag.stype) { | |
548 | case VIO_SUBTYPE_INFO: | |
549 | return process_dreg_info(vio, pkt); | |
550 | ||
551 | case VIO_SUBTYPE_ACK: | |
552 | return process_dreg_ack(vio, pkt); | |
553 | ||
554 | case VIO_SUBTYPE_NACK: | |
555 | return process_dreg_nack(vio, pkt); | |
556 | ||
557 | default: | |
558 | return handshake_failure(vio); | |
559 | } | |
560 | } | |
561 | ||
562 | static int process_dunreg(struct vio_driver_state *vio, | |
563 | struct vio_dring_unregister *pkt) | |
564 | { | |
565 | struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_RX_RING]; | |
566 | ||
567 | viodbg(HS, "GOT DRING_UNREG\n"); | |
568 | ||
569 | if (pkt->dring_ident != dr->ident) | |
570 | return 0; | |
571 | ||
572 | vio->dr_state &= ~VIO_DR_STATE_RXREG; | |
573 | ||
574 | memset(dr, 0, sizeof(*dr)); | |
575 | ||
576 | kfree(vio->desc_buf); | |
577 | vio->desc_buf = NULL; | |
578 | vio->desc_buf_len = 0; | |
579 | ||
580 | return 0; | |
581 | } | |
582 | ||
583 | static int process_rdx_info(struct vio_driver_state *vio, struct vio_rdx *pkt) | |
584 | { | |
585 | viodbg(HS, "GOT RDX INFO\n"); | |
586 | ||
587 | pkt->tag.stype = VIO_SUBTYPE_ACK; | |
588 | viodbg(HS, "SEND RDX ACK\n"); | |
589 | if (send_ctrl(vio, &pkt->tag, sizeof(*pkt)) < 0) | |
590 | return handshake_failure(vio); | |
591 | ||
592 | vio->hs_state |= VIO_HS_SENT_RDX_ACK; | |
593 | return 0; | |
594 | } | |
595 | ||
596 | static int process_rdx_ack(struct vio_driver_state *vio, struct vio_rdx *pkt) | |
597 | { | |
598 | viodbg(HS, "GOT RDX ACK\n"); | |
599 | ||
600 | if (!(vio->hs_state & VIO_HS_SENT_RDX)) | |
601 | return handshake_failure(vio); | |
602 | ||
603 | vio->hs_state |= VIO_HS_GOT_RDX_ACK; | |
604 | return 0; | |
605 | } | |
606 | ||
607 | static int process_rdx_nack(struct vio_driver_state *vio, struct vio_rdx *pkt) | |
608 | { | |
609 | viodbg(HS, "GOT RDX NACK\n"); | |
610 | ||
611 | return handshake_failure(vio); | |
612 | } | |
613 | ||
614 | static int process_rdx(struct vio_driver_state *vio, struct vio_rdx *pkt) | |
615 | { | |
616 | if (!all_drings_registered(vio)) | |
617 | handshake_failure(vio); | |
618 | ||
619 | switch (pkt->tag.stype) { | |
620 | case VIO_SUBTYPE_INFO: | |
621 | return process_rdx_info(vio, pkt); | |
622 | ||
623 | case VIO_SUBTYPE_ACK: | |
624 | return process_rdx_ack(vio, pkt); | |
625 | ||
626 | case VIO_SUBTYPE_NACK: | |
627 | return process_rdx_nack(vio, pkt); | |
628 | ||
629 | default: | |
630 | return handshake_failure(vio); | |
631 | } | |
632 | } | |
633 | ||
634 | int vio_control_pkt_engine(struct vio_driver_state *vio, void *pkt) | |
635 | { | |
636 | struct vio_msg_tag *tag = pkt; | |
637 | u8 prev_state = vio->hs_state; | |
638 | int err; | |
639 | ||
640 | switch (tag->stype_env) { | |
641 | case VIO_VER_INFO: | |
642 | err = process_ver(vio, pkt); | |
643 | break; | |
644 | ||
645 | case VIO_ATTR_INFO: | |
646 | err = process_attr(vio, pkt); | |
647 | break; | |
648 | ||
649 | case VIO_DRING_REG: | |
650 | err = process_dreg(vio, pkt); | |
651 | break; | |
652 | ||
653 | case VIO_DRING_UNREG: | |
654 | err = process_dunreg(vio, pkt); | |
655 | break; | |
656 | ||
657 | case VIO_RDX: | |
658 | err = process_rdx(vio, pkt); | |
659 | break; | |
660 | ||
661 | default: | |
662 | err = process_unknown(vio, pkt); | |
663 | break; | |
664 | } | |
7b6e04a3 | 665 | |
e53e97ce DM |
666 | if (!err && |
667 | vio->hs_state != prev_state && | |
7b6e04a3 JR |
668 | (vio->hs_state & VIO_HS_COMPLETE)) { |
669 | if (vio->ops) | |
670 | vio->ops->handshake_complete(vio); | |
671 | } | |
e53e97ce DM |
672 | |
673 | return err; | |
674 | } | |
675 | EXPORT_SYMBOL(vio_control_pkt_engine); | |
676 | ||
677 | void vio_conn_reset(struct vio_driver_state *vio) | |
678 | { | |
679 | } | |
680 | EXPORT_SYMBOL(vio_conn_reset); | |
681 | ||
682 | /* The issue is that the Solaris virtual disk server just mirrors the | |
683 | * SID values it gets from the client peer. So we work around that | |
684 | * here in vio_{validate,send}_sid() so that the drivers don't need | |
685 | * to be aware of this crap. | |
686 | */ | |
687 | int vio_validate_sid(struct vio_driver_state *vio, struct vio_msg_tag *tp) | |
688 | { | |
689 | u32 sid; | |
690 | ||
691 | /* Always let VERSION+INFO packets through unchecked, they | |
692 | * define the new SID. | |
693 | */ | |
694 | if (tp->type == VIO_TYPE_CTRL && | |
695 | tp->stype == VIO_SUBTYPE_INFO && | |
696 | tp->stype_env == VIO_VER_INFO) | |
697 | return 0; | |
698 | ||
699 | /* Ok, now figure out which SID to use. */ | |
700 | switch (vio->dev_class) { | |
701 | case VDEV_NETWORK: | |
702 | case VDEV_NETWORK_SWITCH: | |
703 | case VDEV_DISK_SERVER: | |
704 | default: | |
705 | sid = vio->_peer_sid; | |
706 | break; | |
707 | ||
708 | case VDEV_DISK: | |
709 | sid = vio->_local_sid; | |
710 | break; | |
711 | } | |
712 | ||
713 | if (sid == tp->sid) | |
714 | return 0; | |
715 | viodbg(DATA, "BAD SID tag->sid[%08x] peer_sid[%08x] local_sid[%08x]\n", | |
716 | tp->sid, vio->_peer_sid, vio->_local_sid); | |
717 | return -EINVAL; | |
718 | } | |
719 | EXPORT_SYMBOL(vio_validate_sid); | |
720 | ||
721 | u32 vio_send_sid(struct vio_driver_state *vio) | |
722 | { | |
723 | switch (vio->dev_class) { | |
724 | case VDEV_NETWORK: | |
725 | case VDEV_NETWORK_SWITCH: | |
726 | case VDEV_DISK: | |
727 | default: | |
728 | return vio->_local_sid; | |
729 | ||
730 | case VDEV_DISK_SERVER: | |
731 | return vio->_peer_sid; | |
732 | } | |
733 | } | |
734 | EXPORT_SYMBOL(vio_send_sid); | |
735 | ||
55fe9771 | 736 | int vio_ldc_alloc(struct vio_driver_state *vio, |
e53e97ce DM |
737 | struct ldc_channel_config *base_cfg, |
738 | void *event_arg) | |
739 | { | |
740 | struct ldc_channel_config cfg = *base_cfg; | |
741 | struct ldc_channel *lp; | |
e53e97ce | 742 | |
43fdf274 DM |
743 | cfg.tx_irq = vio->vdev->tx_irq; |
744 | cfg.rx_irq = vio->vdev->rx_irq; | |
e53e97ce | 745 | |
c21c4ab0 | 746 | lp = ldc_alloc(vio->vdev->channel_id, &cfg, event_arg, vio->name); |
e53e97ce DM |
747 | if (IS_ERR(lp)) |
748 | return PTR_ERR(lp); | |
749 | ||
750 | vio->lp = lp; | |
751 | ||
752 | return 0; | |
753 | } | |
754 | EXPORT_SYMBOL(vio_ldc_alloc); | |
755 | ||
756 | void vio_ldc_free(struct vio_driver_state *vio) | |
757 | { | |
758 | ldc_free(vio->lp); | |
759 | vio->lp = NULL; | |
760 | ||
761 | kfree(vio->desc_buf); | |
762 | vio->desc_buf = NULL; | |
763 | vio->desc_buf_len = 0; | |
764 | } | |
765 | EXPORT_SYMBOL(vio_ldc_free); | |
766 | ||
767 | void vio_port_up(struct vio_driver_state *vio) | |
768 | { | |
769 | unsigned long flags; | |
770 | int err, state; | |
771 | ||
772 | spin_lock_irqsave(&vio->lock, flags); | |
773 | ||
774 | state = ldc_state(vio->lp); | |
775 | ||
776 | err = 0; | |
777 | if (state == LDC_STATE_INIT) { | |
c21c4ab0 | 778 | err = ldc_bind(vio->lp); |
e53e97ce DM |
779 | if (err) |
780 | printk(KERN_WARNING "%s: Port %lu bind failed, " | |
781 | "err=%d\n", | |
43fdf274 | 782 | vio->name, vio->vdev->channel_id, err); |
e53e97ce DM |
783 | } |
784 | ||
785 | if (!err) { | |
01b7a471 JR |
786 | if (ldc_mode(vio->lp) == LDC_MODE_RAW) |
787 | ldc_set_state(vio->lp, LDC_STATE_CONNECTED); | |
788 | else | |
789 | err = ldc_connect(vio->lp); | |
790 | ||
e53e97ce DM |
791 | if (err) |
792 | printk(KERN_WARNING "%s: Port %lu connect failed, " | |
793 | "err=%d\n", | |
43fdf274 | 794 | vio->name, vio->vdev->channel_id, err); |
e53e97ce DM |
795 | } |
796 | if (err) { | |
797 | unsigned long expires = jiffies + HZ; | |
798 | ||
799 | expires = round_jiffies(expires); | |
800 | mod_timer(&vio->timer, expires); | |
801 | } | |
802 | ||
803 | spin_unlock_irqrestore(&vio->lock, flags); | |
804 | } | |
805 | EXPORT_SYMBOL(vio_port_up); | |
806 | ||
ff029687 | 807 | static void vio_port_timer(struct timer_list *t) |
e53e97ce | 808 | { |
ff029687 | 809 | struct vio_driver_state *vio = from_timer(vio, t, timer); |
e53e97ce DM |
810 | |
811 | vio_port_up(vio); | |
812 | } | |
813 | ||
814 | int vio_driver_init(struct vio_driver_state *vio, struct vio_dev *vdev, | |
43fdf274 DM |
815 | u8 dev_class, struct vio_version *ver_table, |
816 | int ver_table_size, struct vio_driver_ops *ops, | |
817 | char *name) | |
e53e97ce DM |
818 | { |
819 | switch (dev_class) { | |
820 | case VDEV_NETWORK: | |
821 | case VDEV_NETWORK_SWITCH: | |
822 | case VDEV_DISK: | |
823 | case VDEV_DISK_SERVER: | |
5d171050 | 824 | case VDEV_CONSOLE_CON: |
e53e97ce DM |
825 | break; |
826 | ||
827 | default: | |
828 | return -EINVAL; | |
829 | } | |
830 | ||
5d171050 JR |
831 | if (dev_class == VDEV_NETWORK || |
832 | dev_class == VDEV_NETWORK_SWITCH || | |
833 | dev_class == VDEV_DISK || | |
834 | dev_class == VDEV_DISK_SERVER) { | |
835 | if (!ops || !ops->send_attr || !ops->handle_attr || | |
836 | !ops->handshake_complete) | |
837 | return -EINVAL; | |
838 | } | |
e53e97ce | 839 | |
e53e97ce DM |
840 | if (!ver_table || ver_table_size < 0) |
841 | return -EINVAL; | |
842 | ||
843 | if (!name) | |
844 | return -EINVAL; | |
845 | ||
846 | spin_lock_init(&vio->lock); | |
847 | ||
848 | vio->name = name; | |
849 | ||
850 | vio->dev_class = dev_class; | |
851 | vio->vdev = vdev; | |
852 | ||
e53e97ce DM |
853 | vio->ver_table = ver_table; |
854 | vio->ver_table_entries = ver_table_size; | |
855 | ||
856 | vio->ops = ops; | |
857 | ||
ff029687 | 858 | timer_setup(&vio->timer, vio_port_timer, 0); |
e53e97ce DM |
859 | |
860 | return 0; | |
861 | } | |
862 | EXPORT_SYMBOL(vio_driver_init); |