1 | // SPDX-License-Identifier: GPL-2.0 |
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> |
8 | #include <linux/export.h> |
9 | #include <linux/string.h> |
10 | #include <linux/delay.h> |
11 | #include <linux/sched.h> |
12 | #include <linux/sched/clock.h> |
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(tag: &pkt.tag, type: VIO_TYPE_CTRL, stype: VIO_SUBTYPE_INFO, stype_env: 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, tag: &pkt.tag, len: 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 | major: vio->ver_table[0].major, |
76 | minor: vio->ver_table[0].minor); |
77 | if (err < 0) |
78 | return err; |
79 | |
80 | return 0; |
81 | } |
82 | |
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(objp: vio->desc_buf); |
95 | vio->desc_buf = NULL; |
96 | |
97 | memset(dr, 0, sizeof(*dr)); |
98 | dr->ident = ident; |
99 | } |
100 | |
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); |
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); |
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(objp: 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" , |
169 | vio->vdev->channel_id); |
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) * |
183 | VIO_MAX_RING_COOKIES)]; |
184 | } u; |
185 | size_t bytes = sizeof(struct vio_dring_register) + |
186 | (sizeof(struct ldc_trans_cookie) * |
187 | dr->ncookies); |
188 | int i; |
189 | |
190 | if (WARN_ON(bytes > sizeof(u))) |
191 | return -EINVAL; |
192 | |
193 | memset(&u, 0, bytes); |
194 | init_tag(tag: &u.pkt.tag, type: VIO_TYPE_CTRL, stype: VIO_SUBTYPE_INFO, stype_env: 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 | |
215 | return send_ctrl(vio, tag: &u.pkt.tag, len: bytes); |
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(tag: &pkt.tag, type: VIO_TYPE_CTRL, stype: VIO_SUBTYPE_INFO, stype_env: VIO_RDX); |
225 | |
226 | viodbg(HS, "SEND RDX INFO\n" ); |
227 | |
228 | return send_ctrl(vio, tag: &pkt.tag, len: sizeof(pkt)); |
229 | } |
230 | |
231 | static int send_attr(struct vio_driver_state *vio) |
232 | { |
233 | if (!vio->ops) |
234 | return -EINVAL; |
235 | |
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, major: 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; |
296 | pkt->dev_class = vio->dev_class; |
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 | |
352 | if (pkt->major == 0 && pkt->minor == 0) |
353 | return handshake_failure(vio); |
354 | nver = find_by_major(vio, major: pkt->major); |
355 | if (!nver) |
356 | return handshake_failure(vio); |
357 | |
358 | if (send_version(vio, major: nver->major, minor: 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); |
378 | } |
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 | |
388 | if (!vio->ops) |
389 | return 0; |
390 | |
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 | } |
405 | |
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; |
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 | |
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 | |
452 | BUG_ON(vio->desc_buf); |
453 | |
454 | vio->desc_buf = kzalloc(size: 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 | |
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); |
484 | |
485 | if (send_ctrl(vio, &pkt->tag, struct_size(pkt, cookies, dr->ncookies)) < 0) |
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(objp: 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, arg: pkt); |
661 | break; |
662 | } |
663 | |
664 | if (!err && |
665 | vio->hs_state != prev_state && |
666 | (vio->hs_state & VIO_HS_COMPLETE)) { |
667 | if (vio->ops) |
668 | vio->ops->handshake_complete(vio); |
669 | } |
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 | |
734 | int vio_ldc_alloc(struct vio_driver_state *vio, |
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; |
740 | |
741 | cfg.tx_irq = vio->vdev->tx_irq; |
742 | cfg.rx_irq = vio->vdev->rx_irq; |
743 | |
744 | lp = ldc_alloc(vio->vdev->channel_id, &cfg, event_arg, vio->name); |
745 | if (IS_ERR(ptr: lp)) |
746 | return PTR_ERR(ptr: 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(objp: 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) { |
776 | err = ldc_bind(vio->lp); |
777 | if (err) |
778 | printk(KERN_WARNING "%s: Port %lu bind failed, " |
779 | "err=%d\n" , |
780 | vio->name, vio->vdev->channel_id, err); |
781 | } |
782 | |
783 | if (!err) { |
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 | |
789 | if (err) |
790 | printk(KERN_WARNING "%s: Port %lu connect failed, " |
791 | "err=%d\n" , |
792 | vio->name, vio->vdev->channel_id, err); |
793 | } |
794 | if (err) { |
795 | unsigned long expires = jiffies + HZ; |
796 | |
797 | expires = round_jiffies(j: expires); |
798 | mod_timer(timer: &vio->timer, expires); |
799 | } |
800 | |
801 | spin_unlock_irqrestore(lock: &vio->lock, flags); |
802 | } |
803 | EXPORT_SYMBOL(vio_port_up); |
804 | |
805 | static void vio_port_timer(struct timer_list *t) |
806 | { |
807 | struct vio_driver_state *vio = from_timer(vio, t, timer); |
808 | |
809 | vio_port_up(vio); |
810 | } |
811 | |
812 | int vio_driver_init(struct vio_driver_state *vio, struct vio_dev *vdev, |
813 | u8 dev_class, struct vio_version *ver_table, |
814 | int ver_table_size, struct vio_driver_ops *ops, |
815 | char *name) |
816 | { |
817 | switch (dev_class) { |
818 | case VDEV_NETWORK: |
819 | case VDEV_NETWORK_SWITCH: |
820 | case VDEV_DISK: |
821 | case VDEV_DISK_SERVER: |
822 | case VDEV_CONSOLE_CON: |
823 | break; |
824 | |
825 | default: |
826 | return -EINVAL; |
827 | } |
828 | |
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 | } |
837 | |
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 | |
851 | vio->ver_table = ver_table; |
852 | vio->ver_table_entries = ver_table_size; |
853 | |
854 | vio->ops = ops; |
855 | |
856 | timer_setup(&vio->timer, vio_port_timer, 0); |
857 | |
858 | return 0; |
859 | } |
860 | EXPORT_SYMBOL(vio_driver_init); |
861 | |