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Commit | Line | Data |
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f942dc25 IC |
1 | /* |
2 | * Xenbus code for netif backend | |
3 | * | |
4 | * Copyright (C) 2005 Rusty Russell <rusty@rustcorp.com.au> | |
5 | * Copyright (C) 2005 XenSource Ltd | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include "common.h" | |
23 | ||
24 | struct backend_info { | |
25 | struct xenbus_device *dev; | |
26 | struct xenvif *vif; | |
ea732dff PD |
27 | |
28 | /* This is the state that will be reflected in xenstore when any | |
29 | * active hotplug script completes. | |
30 | */ | |
31 | enum xenbus_state state; | |
32 | ||
f942dc25 IC |
33 | enum xenbus_state frontend_state; |
34 | struct xenbus_watch hotplug_status_watch; | |
17938a69 | 35 | u8 have_hotplug_status_watch:1; |
f942dc25 IC |
36 | }; |
37 | ||
38 | static int connect_rings(struct backend_info *); | |
39 | static void connect(struct backend_info *); | |
40 | static void backend_create_xenvif(struct backend_info *be); | |
41 | static void unregister_hotplug_status_watch(struct backend_info *be); | |
dc62ccac DV |
42 | static void set_backend_state(struct backend_info *be, |
43 | enum xenbus_state state); | |
f942dc25 IC |
44 | |
45 | static int netback_remove(struct xenbus_device *dev) | |
46 | { | |
47 | struct backend_info *be = dev_get_drvdata(&dev->dev); | |
48 | ||
dc62ccac DV |
49 | set_backend_state(be, XenbusStateClosed); |
50 | ||
f942dc25 IC |
51 | unregister_hotplug_status_watch(be); |
52 | if (be->vif) { | |
53 | kobject_uevent(&dev->dev.kobj, KOBJ_OFFLINE); | |
54 | xenbus_rm(XBT_NIL, dev->nodename, "hotplug-status"); | |
279f438e | 55 | xenvif_free(be->vif); |
f942dc25 IC |
56 | be->vif = NULL; |
57 | } | |
58 | kfree(be); | |
59 | dev_set_drvdata(&dev->dev, NULL); | |
60 | return 0; | |
61 | } | |
62 | ||
63 | ||
64 | /** | |
65 | * Entry point to this code when a new device is created. Allocate the basic | |
66 | * structures and switch to InitWait. | |
67 | */ | |
68 | static int netback_probe(struct xenbus_device *dev, | |
69 | const struct xenbus_device_id *id) | |
70 | { | |
71 | const char *message; | |
72 | struct xenbus_transaction xbt; | |
73 | int err; | |
74 | int sg; | |
75 | struct backend_info *be = kzalloc(sizeof(struct backend_info), | |
76 | GFP_KERNEL); | |
77 | if (!be) { | |
78 | xenbus_dev_fatal(dev, -ENOMEM, | |
79 | "allocating backend structure"); | |
80 | return -ENOMEM; | |
81 | } | |
82 | ||
83 | be->dev = dev; | |
84 | dev_set_drvdata(&dev->dev, be); | |
85 | ||
86 | sg = 1; | |
87 | ||
88 | do { | |
89 | err = xenbus_transaction_start(&xbt); | |
90 | if (err) { | |
91 | xenbus_dev_fatal(dev, err, "starting transaction"); | |
92 | goto fail; | |
93 | } | |
94 | ||
95 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", sg); | |
96 | if (err) { | |
97 | message = "writing feature-sg"; | |
98 | goto abort_transaction; | |
99 | } | |
100 | ||
101 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", | |
102 | "%d", sg); | |
103 | if (err) { | |
104 | message = "writing feature-gso-tcpv4"; | |
105 | goto abort_transaction; | |
106 | } | |
107 | ||
108 | /* We support rx-copy path. */ | |
109 | err = xenbus_printf(xbt, dev->nodename, | |
110 | "feature-rx-copy", "%d", 1); | |
111 | if (err) { | |
112 | message = "writing feature-rx-copy"; | |
113 | goto abort_transaction; | |
114 | } | |
115 | ||
116 | /* | |
117 | * We don't support rx-flip path (except old guests who don't | |
118 | * grok this feature flag). | |
119 | */ | |
120 | err = xenbus_printf(xbt, dev->nodename, | |
121 | "feature-rx-flip", "%d", 0); | |
122 | if (err) { | |
123 | message = "writing feature-rx-flip"; | |
124 | goto abort_transaction; | |
125 | } | |
126 | ||
127 | err = xenbus_transaction_end(xbt, 0); | |
128 | } while (err == -EAGAIN); | |
129 | ||
130 | if (err) { | |
131 | xenbus_dev_fatal(dev, err, "completing transaction"); | |
132 | goto fail; | |
133 | } | |
134 | ||
e1f00a69 WL |
135 | /* |
136 | * Split event channels support, this is optional so it is not | |
137 | * put inside the above loop. | |
138 | */ | |
139 | err = xenbus_printf(XBT_NIL, dev->nodename, | |
140 | "feature-split-event-channels", | |
141 | "%u", separate_tx_rx_irq); | |
142 | if (err) | |
8ef2c3bc | 143 | pr_debug("Error writing feature-split-event-channels\n"); |
e1f00a69 | 144 | |
f942dc25 IC |
145 | err = xenbus_switch_state(dev, XenbusStateInitWait); |
146 | if (err) | |
147 | goto fail; | |
148 | ||
ea732dff PD |
149 | be->state = XenbusStateInitWait; |
150 | ||
f942dc25 IC |
151 | /* This kicks hotplug scripts, so do it immediately. */ |
152 | backend_create_xenvif(be); | |
153 | ||
154 | return 0; | |
155 | ||
156 | abort_transaction: | |
157 | xenbus_transaction_end(xbt, 1); | |
158 | xenbus_dev_fatal(dev, err, "%s", message); | |
159 | fail: | |
8ef2c3bc | 160 | pr_debug("failed\n"); |
f942dc25 IC |
161 | netback_remove(dev); |
162 | return err; | |
163 | } | |
164 | ||
165 | ||
166 | /* | |
167 | * Handle the creation of the hotplug script environment. We add the script | |
168 | * and vif variables to the environment, for the benefit of the vif-* hotplug | |
169 | * scripts. | |
170 | */ | |
171 | static int netback_uevent(struct xenbus_device *xdev, | |
172 | struct kobj_uevent_env *env) | |
173 | { | |
174 | struct backend_info *be = dev_get_drvdata(&xdev->dev); | |
175 | char *val; | |
176 | ||
177 | val = xenbus_read(XBT_NIL, xdev->nodename, "script", NULL); | |
178 | if (IS_ERR(val)) { | |
179 | int err = PTR_ERR(val); | |
180 | xenbus_dev_fatal(xdev, err, "reading script"); | |
181 | return err; | |
182 | } else { | |
183 | if (add_uevent_var(env, "script=%s", val)) { | |
184 | kfree(val); | |
185 | return -ENOMEM; | |
186 | } | |
187 | kfree(val); | |
188 | } | |
189 | ||
190 | if (!be || !be->vif) | |
191 | return 0; | |
192 | ||
193 | return add_uevent_var(env, "vif=%s", be->vif->dev->name); | |
194 | } | |
195 | ||
196 | ||
197 | static void backend_create_xenvif(struct backend_info *be) | |
198 | { | |
199 | int err; | |
200 | long handle; | |
201 | struct xenbus_device *dev = be->dev; | |
202 | ||
203 | if (be->vif != NULL) | |
204 | return; | |
205 | ||
206 | err = xenbus_scanf(XBT_NIL, dev->nodename, "handle", "%li", &handle); | |
207 | if (err != 1) { | |
208 | xenbus_dev_fatal(dev, err, "reading handle"); | |
209 | return; | |
210 | } | |
211 | ||
212 | be->vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle); | |
213 | if (IS_ERR(be->vif)) { | |
214 | err = PTR_ERR(be->vif); | |
215 | be->vif = NULL; | |
216 | xenbus_dev_fatal(dev, err, "creating interface"); | |
217 | return; | |
218 | } | |
219 | ||
220 | kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE); | |
221 | } | |
222 | ||
ea732dff | 223 | static void backend_disconnect(struct backend_info *be) |
f942dc25 | 224 | { |
279f438e PD |
225 | if (be->vif) |
226 | xenvif_disconnect(be->vif); | |
227 | } | |
228 | ||
ea732dff | 229 | static void backend_connect(struct backend_info *be) |
279f438e | 230 | { |
ea732dff PD |
231 | if (be->vif) |
232 | connect(be); | |
233 | } | |
279f438e | 234 | |
ea732dff PD |
235 | static inline void backend_switch_state(struct backend_info *be, |
236 | enum xenbus_state state) | |
237 | { | |
238 | struct xenbus_device *dev = be->dev; | |
239 | ||
240 | pr_debug("%s -> %s\n", dev->nodename, xenbus_strstate(state)); | |
241 | be->state = state; | |
242 | ||
243 | /* If we are waiting for a hotplug script then defer the | |
244 | * actual xenbus state change. | |
245 | */ | |
246 | if (!be->have_hotplug_status_watch) | |
247 | xenbus_switch_state(dev, state); | |
248 | } | |
249 | ||
250 | /* Handle backend state transitions: | |
251 | * | |
252 | * The backend state starts in InitWait and the following transitions are | |
253 | * allowed. | |
254 | * | |
255 | * InitWait -> Connected | |
256 | * | |
257 | * ^ \ | | |
258 | * | \ | | |
259 | * | \ | | |
260 | * | \ | | |
261 | * | \ | | |
262 | * | \ | | |
263 | * | V V | |
264 | * | |
265 | * Closed <-> Closing | |
266 | * | |
267 | * The state argument specifies the eventual state of the backend and the | |
268 | * function transitions to that state via the shortest path. | |
269 | */ | |
270 | static void set_backend_state(struct backend_info *be, | |
271 | enum xenbus_state state) | |
272 | { | |
273 | while (be->state != state) { | |
274 | switch (be->state) { | |
275 | case XenbusStateClosed: | |
276 | switch (state) { | |
277 | case XenbusStateInitWait: | |
278 | case XenbusStateConnected: | |
279 | pr_info("%s: prepare for reconnect\n", | |
280 | be->dev->nodename); | |
281 | backend_switch_state(be, XenbusStateInitWait); | |
282 | break; | |
283 | case XenbusStateClosing: | |
284 | backend_switch_state(be, XenbusStateClosing); | |
285 | break; | |
286 | default: | |
287 | BUG(); | |
288 | } | |
289 | break; | |
290 | case XenbusStateInitWait: | |
291 | switch (state) { | |
292 | case XenbusStateConnected: | |
293 | backend_connect(be); | |
294 | backend_switch_state(be, XenbusStateConnected); | |
295 | break; | |
296 | case XenbusStateClosing: | |
297 | case XenbusStateClosed: | |
298 | backend_switch_state(be, XenbusStateClosing); | |
299 | break; | |
300 | default: | |
301 | BUG(); | |
302 | } | |
303 | break; | |
304 | case XenbusStateConnected: | |
305 | switch (state) { | |
306 | case XenbusStateInitWait: | |
307 | case XenbusStateClosing: | |
308 | case XenbusStateClosed: | |
309 | backend_disconnect(be); | |
310 | backend_switch_state(be, XenbusStateClosing); | |
311 | break; | |
312 | default: | |
313 | BUG(); | |
314 | } | |
315 | break; | |
316 | case XenbusStateClosing: | |
317 | switch (state) { | |
318 | case XenbusStateInitWait: | |
319 | case XenbusStateConnected: | |
320 | case XenbusStateClosed: | |
321 | backend_switch_state(be, XenbusStateClosed); | |
322 | break; | |
323 | default: | |
324 | BUG(); | |
325 | } | |
326 | break; | |
327 | default: | |
328 | BUG(); | |
329 | } | |
f942dc25 IC |
330 | } |
331 | } | |
332 | ||
333 | /** | |
334 | * Callback received when the frontend's state changes. | |
335 | */ | |
336 | static void frontend_changed(struct xenbus_device *dev, | |
337 | enum xenbus_state frontend_state) | |
338 | { | |
339 | struct backend_info *be = dev_get_drvdata(&dev->dev); | |
340 | ||
ea732dff | 341 | pr_debug("%s -> %s\n", dev->otherend, xenbus_strstate(frontend_state)); |
f942dc25 IC |
342 | |
343 | be->frontend_state = frontend_state; | |
344 | ||
345 | switch (frontend_state) { | |
346 | case XenbusStateInitialising: | |
ea732dff | 347 | set_backend_state(be, XenbusStateInitWait); |
f942dc25 IC |
348 | break; |
349 | ||
350 | case XenbusStateInitialised: | |
351 | break; | |
352 | ||
353 | case XenbusStateConnected: | |
ea732dff | 354 | set_backend_state(be, XenbusStateConnected); |
f942dc25 IC |
355 | break; |
356 | ||
357 | case XenbusStateClosing: | |
ea732dff | 358 | set_backend_state(be, XenbusStateClosing); |
f942dc25 IC |
359 | break; |
360 | ||
361 | case XenbusStateClosed: | |
ea732dff | 362 | set_backend_state(be, XenbusStateClosed); |
f942dc25 IC |
363 | if (xenbus_dev_is_online(dev)) |
364 | break; | |
365 | /* fall through if not online */ | |
366 | case XenbusStateUnknown: | |
ea732dff | 367 | set_backend_state(be, XenbusStateClosed); |
f942dc25 IC |
368 | device_unregister(&dev->dev); |
369 | break; | |
370 | ||
371 | default: | |
372 | xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend", | |
373 | frontend_state); | |
374 | break; | |
375 | } | |
376 | } | |
377 | ||
378 | ||
379 | static void xen_net_read_rate(struct xenbus_device *dev, | |
380 | unsigned long *bytes, unsigned long *usec) | |
381 | { | |
382 | char *s, *e; | |
383 | unsigned long b, u; | |
384 | char *ratestr; | |
385 | ||
386 | /* Default to unlimited bandwidth. */ | |
387 | *bytes = ~0UL; | |
388 | *usec = 0; | |
389 | ||
390 | ratestr = xenbus_read(XBT_NIL, dev->nodename, "rate", NULL); | |
391 | if (IS_ERR(ratestr)) | |
392 | return; | |
393 | ||
394 | s = ratestr; | |
395 | b = simple_strtoul(s, &e, 10); | |
396 | if ((s == e) || (*e != ',')) | |
397 | goto fail; | |
398 | ||
399 | s = e + 1; | |
400 | u = simple_strtoul(s, &e, 10); | |
401 | if ((s == e) || (*e != '\0')) | |
402 | goto fail; | |
403 | ||
404 | *bytes = b; | |
405 | *usec = u; | |
406 | ||
407 | kfree(ratestr); | |
408 | return; | |
409 | ||
410 | fail: | |
411 | pr_warn("Failed to parse network rate limit. Traffic unlimited.\n"); | |
412 | kfree(ratestr); | |
413 | } | |
414 | ||
415 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | |
416 | { | |
417 | char *s, *e, *macstr; | |
418 | int i; | |
419 | ||
420 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | |
421 | if (IS_ERR(macstr)) | |
422 | return PTR_ERR(macstr); | |
423 | ||
424 | for (i = 0; i < ETH_ALEN; i++) { | |
425 | mac[i] = simple_strtoul(s, &e, 16); | |
426 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | |
427 | kfree(macstr); | |
428 | return -ENOENT; | |
429 | } | |
430 | s = e+1; | |
431 | } | |
432 | ||
433 | kfree(macstr); | |
434 | return 0; | |
435 | } | |
436 | ||
437 | static void unregister_hotplug_status_watch(struct backend_info *be) | |
438 | { | |
439 | if (be->have_hotplug_status_watch) { | |
440 | unregister_xenbus_watch(&be->hotplug_status_watch); | |
441 | kfree(be->hotplug_status_watch.node); | |
442 | } | |
443 | be->have_hotplug_status_watch = 0; | |
444 | } | |
445 | ||
446 | static void hotplug_status_changed(struct xenbus_watch *watch, | |
447 | const char **vec, | |
448 | unsigned int vec_size) | |
449 | { | |
450 | struct backend_info *be = container_of(watch, | |
451 | struct backend_info, | |
452 | hotplug_status_watch); | |
453 | char *str; | |
454 | unsigned int len; | |
455 | ||
456 | str = xenbus_read(XBT_NIL, be->dev->nodename, "hotplug-status", &len); | |
457 | if (IS_ERR(str)) | |
458 | return; | |
459 | if (len == sizeof("connected")-1 && !memcmp(str, "connected", len)) { | |
ea732dff PD |
460 | /* Complete any pending state change */ |
461 | xenbus_switch_state(be->dev, be->state); | |
462 | ||
f942dc25 IC |
463 | /* Not interested in this watch anymore. */ |
464 | unregister_hotplug_status_watch(be); | |
465 | } | |
466 | kfree(str); | |
467 | } | |
468 | ||
469 | static void connect(struct backend_info *be) | |
470 | { | |
471 | int err; | |
472 | struct xenbus_device *dev = be->dev; | |
473 | ||
474 | err = connect_rings(be); | |
475 | if (err) | |
476 | return; | |
477 | ||
478 | err = xen_net_read_mac(dev, be->vif->fe_dev_addr); | |
479 | if (err) { | |
480 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | |
481 | return; | |
482 | } | |
483 | ||
484 | xen_net_read_rate(dev, &be->vif->credit_bytes, | |
485 | &be->vif->credit_usec); | |
486 | be->vif->remaining_credit = be->vif->credit_bytes; | |
487 | ||
488 | unregister_hotplug_status_watch(be); | |
489 | err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch, | |
490 | hotplug_status_changed, | |
491 | "%s/%s", dev->nodename, "hotplug-status"); | |
ea732dff | 492 | if (!err) |
f942dc25 | 493 | be->have_hotplug_status_watch = 1; |
f942dc25 IC |
494 | |
495 | netif_wake_queue(be->vif->dev); | |
496 | } | |
497 | ||
498 | ||
499 | static int connect_rings(struct backend_info *be) | |
500 | { | |
501 | struct xenvif *vif = be->vif; | |
502 | struct xenbus_device *dev = be->dev; | |
503 | unsigned long tx_ring_ref, rx_ring_ref; | |
e1f00a69 | 504 | unsigned int tx_evtchn, rx_evtchn, rx_copy; |
f942dc25 IC |
505 | int err; |
506 | int val; | |
507 | ||
508 | err = xenbus_gather(XBT_NIL, dev->otherend, | |
509 | "tx-ring-ref", "%lu", &tx_ring_ref, | |
e1f00a69 | 510 | "rx-ring-ref", "%lu", &rx_ring_ref, NULL); |
f942dc25 IC |
511 | if (err) { |
512 | xenbus_dev_fatal(dev, err, | |
e1f00a69 | 513 | "reading %s/ring-ref", |
f942dc25 IC |
514 | dev->otherend); |
515 | return err; | |
516 | } | |
517 | ||
e1f00a69 WL |
518 | /* Try split event channels first, then single event channel. */ |
519 | err = xenbus_gather(XBT_NIL, dev->otherend, | |
520 | "event-channel-tx", "%u", &tx_evtchn, | |
521 | "event-channel-rx", "%u", &rx_evtchn, NULL); | |
522 | if (err < 0) { | |
523 | err = xenbus_scanf(XBT_NIL, dev->otherend, | |
524 | "event-channel", "%u", &tx_evtchn); | |
525 | if (err < 0) { | |
526 | xenbus_dev_fatal(dev, err, | |
527 | "reading %s/event-channel(-tx/rx)", | |
528 | dev->otherend); | |
529 | return err; | |
530 | } | |
531 | rx_evtchn = tx_evtchn; | |
532 | } | |
533 | ||
f942dc25 IC |
534 | err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u", |
535 | &rx_copy); | |
536 | if (err == -ENOENT) { | |
537 | err = 0; | |
538 | rx_copy = 0; | |
539 | } | |
540 | if (err < 0) { | |
541 | xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy", | |
542 | dev->otherend); | |
543 | return err; | |
544 | } | |
545 | if (!rx_copy) | |
546 | return -EOPNOTSUPP; | |
547 | ||
548 | if (vif->dev->tx_queue_len != 0) { | |
549 | if (xenbus_scanf(XBT_NIL, dev->otherend, | |
550 | "feature-rx-notify", "%d", &val) < 0) | |
551 | val = 0; | |
552 | if (val) | |
553 | vif->can_queue = 1; | |
554 | else | |
555 | /* Must be non-zero for pfifo_fast to work. */ | |
556 | vif->dev->tx_queue_len = 1; | |
557 | } | |
558 | ||
559 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg", | |
560 | "%d", &val) < 0) | |
561 | val = 0; | |
562 | vif->can_sg = !!val; | |
563 | ||
564 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4", | |
565 | "%d", &val) < 0) | |
566 | val = 0; | |
567 | vif->gso = !!val; | |
568 | ||
569 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4-prefix", | |
570 | "%d", &val) < 0) | |
571 | val = 0; | |
572 | vif->gso_prefix = !!val; | |
573 | ||
574 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload", | |
575 | "%d", &val) < 0) | |
576 | val = 0; | |
577 | vif->csum = !val; | |
578 | ||
579 | /* Map the shared frame, irq etc. */ | |
e1f00a69 WL |
580 | err = xenvif_connect(vif, tx_ring_ref, rx_ring_ref, |
581 | tx_evtchn, rx_evtchn); | |
f942dc25 IC |
582 | if (err) { |
583 | xenbus_dev_fatal(dev, err, | |
e1f00a69 WL |
584 | "mapping shared-frames %lu/%lu port tx %u rx %u", |
585 | tx_ring_ref, rx_ring_ref, | |
586 | tx_evtchn, rx_evtchn); | |
f942dc25 IC |
587 | return err; |
588 | } | |
589 | return 0; | |
590 | } | |
591 | ||
592 | ||
593 | /* ** Driver Registration ** */ | |
594 | ||
595 | ||
596 | static const struct xenbus_device_id netback_ids[] = { | |
597 | { "vif" }, | |
598 | { "" } | |
599 | }; | |
600 | ||
601 | ||
73db144b | 602 | static DEFINE_XENBUS_DRIVER(netback, , |
f942dc25 IC |
603 | .probe = netback_probe, |
604 | .remove = netback_remove, | |
605 | .uevent = netback_uevent, | |
606 | .otherend_changed = frontend_changed, | |
73db144b | 607 | ); |
f942dc25 IC |
608 | |
609 | int xenvif_xenbus_init(void) | |
610 | { | |
73db144b | 611 | return xenbus_register_backend(&netback_driver); |
f942dc25 | 612 | } |
b103f358 WL |
613 | |
614 | void xenvif_xenbus_fini(void) | |
615 | { | |
616 | return xenbus_unregister_driver(&netback_driver); | |
617 | } |