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 | ||
2eba61d5 PD |
108 | /* We support partial checksum setup for IPv6 packets */ |
109 | err = xenbus_printf(xbt, dev->nodename, | |
110 | "feature-ipv6-csum-offload", | |
111 | "%d", 1); | |
112 | if (err) { | |
113 | message = "writing feature-ipv6-csum-offload"; | |
114 | goto abort_transaction; | |
115 | } | |
116 | ||
f942dc25 IC |
117 | /* We support rx-copy path. */ |
118 | err = xenbus_printf(xbt, dev->nodename, | |
119 | "feature-rx-copy", "%d", 1); | |
120 | if (err) { | |
121 | message = "writing feature-rx-copy"; | |
122 | goto abort_transaction; | |
123 | } | |
124 | ||
125 | /* | |
126 | * We don't support rx-flip path (except old guests who don't | |
127 | * grok this feature flag). | |
128 | */ | |
129 | err = xenbus_printf(xbt, dev->nodename, | |
130 | "feature-rx-flip", "%d", 0); | |
131 | if (err) { | |
132 | message = "writing feature-rx-flip"; | |
133 | goto abort_transaction; | |
134 | } | |
135 | ||
136 | err = xenbus_transaction_end(xbt, 0); | |
137 | } while (err == -EAGAIN); | |
138 | ||
139 | if (err) { | |
140 | xenbus_dev_fatal(dev, err, "completing transaction"); | |
141 | goto fail; | |
142 | } | |
143 | ||
e1f00a69 WL |
144 | /* |
145 | * Split event channels support, this is optional so it is not | |
146 | * put inside the above loop. | |
147 | */ | |
148 | err = xenbus_printf(XBT_NIL, dev->nodename, | |
149 | "feature-split-event-channels", | |
150 | "%u", separate_tx_rx_irq); | |
151 | if (err) | |
8ef2c3bc | 152 | pr_debug("Error writing feature-split-event-channels\n"); |
e1f00a69 | 153 | |
f942dc25 IC |
154 | err = xenbus_switch_state(dev, XenbusStateInitWait); |
155 | if (err) | |
156 | goto fail; | |
157 | ||
ea732dff PD |
158 | be->state = XenbusStateInitWait; |
159 | ||
f942dc25 IC |
160 | /* This kicks hotplug scripts, so do it immediately. */ |
161 | backend_create_xenvif(be); | |
162 | ||
163 | return 0; | |
164 | ||
165 | abort_transaction: | |
166 | xenbus_transaction_end(xbt, 1); | |
167 | xenbus_dev_fatal(dev, err, "%s", message); | |
168 | fail: | |
8ef2c3bc | 169 | pr_debug("failed\n"); |
f942dc25 IC |
170 | netback_remove(dev); |
171 | return err; | |
172 | } | |
173 | ||
174 | ||
175 | /* | |
176 | * Handle the creation of the hotplug script environment. We add the script | |
177 | * and vif variables to the environment, for the benefit of the vif-* hotplug | |
178 | * scripts. | |
179 | */ | |
180 | static int netback_uevent(struct xenbus_device *xdev, | |
181 | struct kobj_uevent_env *env) | |
182 | { | |
183 | struct backend_info *be = dev_get_drvdata(&xdev->dev); | |
184 | char *val; | |
185 | ||
186 | val = xenbus_read(XBT_NIL, xdev->nodename, "script", NULL); | |
187 | if (IS_ERR(val)) { | |
188 | int err = PTR_ERR(val); | |
189 | xenbus_dev_fatal(xdev, err, "reading script"); | |
190 | return err; | |
191 | } else { | |
192 | if (add_uevent_var(env, "script=%s", val)) { | |
193 | kfree(val); | |
194 | return -ENOMEM; | |
195 | } | |
196 | kfree(val); | |
197 | } | |
198 | ||
199 | if (!be || !be->vif) | |
200 | return 0; | |
201 | ||
202 | return add_uevent_var(env, "vif=%s", be->vif->dev->name); | |
203 | } | |
204 | ||
205 | ||
206 | static void backend_create_xenvif(struct backend_info *be) | |
207 | { | |
208 | int err; | |
209 | long handle; | |
210 | struct xenbus_device *dev = be->dev; | |
211 | ||
212 | if (be->vif != NULL) | |
213 | return; | |
214 | ||
215 | err = xenbus_scanf(XBT_NIL, dev->nodename, "handle", "%li", &handle); | |
216 | if (err != 1) { | |
217 | xenbus_dev_fatal(dev, err, "reading handle"); | |
218 | return; | |
219 | } | |
220 | ||
221 | be->vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle); | |
222 | if (IS_ERR(be->vif)) { | |
223 | err = PTR_ERR(be->vif); | |
224 | be->vif = NULL; | |
225 | xenbus_dev_fatal(dev, err, "creating interface"); | |
226 | return; | |
227 | } | |
228 | ||
229 | kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE); | |
230 | } | |
231 | ||
ea732dff | 232 | static void backend_disconnect(struct backend_info *be) |
f942dc25 | 233 | { |
279f438e PD |
234 | if (be->vif) |
235 | xenvif_disconnect(be->vif); | |
236 | } | |
237 | ||
ea732dff | 238 | static void backend_connect(struct backend_info *be) |
279f438e | 239 | { |
ea732dff PD |
240 | if (be->vif) |
241 | connect(be); | |
242 | } | |
279f438e | 243 | |
ea732dff PD |
244 | static inline void backend_switch_state(struct backend_info *be, |
245 | enum xenbus_state state) | |
246 | { | |
247 | struct xenbus_device *dev = be->dev; | |
248 | ||
249 | pr_debug("%s -> %s\n", dev->nodename, xenbus_strstate(state)); | |
250 | be->state = state; | |
251 | ||
252 | /* If we are waiting for a hotplug script then defer the | |
253 | * actual xenbus state change. | |
254 | */ | |
255 | if (!be->have_hotplug_status_watch) | |
256 | xenbus_switch_state(dev, state); | |
257 | } | |
258 | ||
259 | /* Handle backend state transitions: | |
260 | * | |
261 | * The backend state starts in InitWait and the following transitions are | |
262 | * allowed. | |
263 | * | |
264 | * InitWait -> Connected | |
265 | * | |
266 | * ^ \ | | |
267 | * | \ | | |
268 | * | \ | | |
269 | * | \ | | |
270 | * | \ | | |
271 | * | \ | | |
272 | * | V V | |
273 | * | |
274 | * Closed <-> Closing | |
275 | * | |
276 | * The state argument specifies the eventual state of the backend and the | |
277 | * function transitions to that state via the shortest path. | |
278 | */ | |
279 | static void set_backend_state(struct backend_info *be, | |
280 | enum xenbus_state state) | |
281 | { | |
282 | while (be->state != state) { | |
283 | switch (be->state) { | |
284 | case XenbusStateClosed: | |
285 | switch (state) { | |
286 | case XenbusStateInitWait: | |
287 | case XenbusStateConnected: | |
288 | pr_info("%s: prepare for reconnect\n", | |
289 | be->dev->nodename); | |
290 | backend_switch_state(be, XenbusStateInitWait); | |
291 | break; | |
292 | case XenbusStateClosing: | |
293 | backend_switch_state(be, XenbusStateClosing); | |
294 | break; | |
295 | default: | |
296 | BUG(); | |
297 | } | |
298 | break; | |
299 | case XenbusStateInitWait: | |
300 | switch (state) { | |
301 | case XenbusStateConnected: | |
302 | backend_connect(be); | |
303 | backend_switch_state(be, XenbusStateConnected); | |
304 | break; | |
305 | case XenbusStateClosing: | |
306 | case XenbusStateClosed: | |
307 | backend_switch_state(be, XenbusStateClosing); | |
308 | break; | |
309 | default: | |
310 | BUG(); | |
311 | } | |
312 | break; | |
313 | case XenbusStateConnected: | |
314 | switch (state) { | |
315 | case XenbusStateInitWait: | |
316 | case XenbusStateClosing: | |
317 | case XenbusStateClosed: | |
318 | backend_disconnect(be); | |
319 | backend_switch_state(be, XenbusStateClosing); | |
320 | break; | |
321 | default: | |
322 | BUG(); | |
323 | } | |
324 | break; | |
325 | case XenbusStateClosing: | |
326 | switch (state) { | |
327 | case XenbusStateInitWait: | |
328 | case XenbusStateConnected: | |
329 | case XenbusStateClosed: | |
330 | backend_switch_state(be, XenbusStateClosed); | |
331 | break; | |
332 | default: | |
333 | BUG(); | |
334 | } | |
335 | break; | |
336 | default: | |
337 | BUG(); | |
338 | } | |
f942dc25 IC |
339 | } |
340 | } | |
341 | ||
342 | /** | |
343 | * Callback received when the frontend's state changes. | |
344 | */ | |
345 | static void frontend_changed(struct xenbus_device *dev, | |
346 | enum xenbus_state frontend_state) | |
347 | { | |
348 | struct backend_info *be = dev_get_drvdata(&dev->dev); | |
349 | ||
ea732dff | 350 | pr_debug("%s -> %s\n", dev->otherend, xenbus_strstate(frontend_state)); |
f942dc25 IC |
351 | |
352 | be->frontend_state = frontend_state; | |
353 | ||
354 | switch (frontend_state) { | |
355 | case XenbusStateInitialising: | |
ea732dff | 356 | set_backend_state(be, XenbusStateInitWait); |
f942dc25 IC |
357 | break; |
358 | ||
359 | case XenbusStateInitialised: | |
360 | break; | |
361 | ||
362 | case XenbusStateConnected: | |
ea732dff | 363 | set_backend_state(be, XenbusStateConnected); |
f942dc25 IC |
364 | break; |
365 | ||
366 | case XenbusStateClosing: | |
ea732dff | 367 | set_backend_state(be, XenbusStateClosing); |
f942dc25 IC |
368 | break; |
369 | ||
370 | case XenbusStateClosed: | |
ea732dff | 371 | set_backend_state(be, XenbusStateClosed); |
f942dc25 IC |
372 | if (xenbus_dev_is_online(dev)) |
373 | break; | |
374 | /* fall through if not online */ | |
375 | case XenbusStateUnknown: | |
ea732dff | 376 | set_backend_state(be, XenbusStateClosed); |
f942dc25 IC |
377 | device_unregister(&dev->dev); |
378 | break; | |
379 | ||
380 | default: | |
381 | xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend", | |
382 | frontend_state); | |
383 | break; | |
384 | } | |
385 | } | |
386 | ||
387 | ||
388 | static void xen_net_read_rate(struct xenbus_device *dev, | |
389 | unsigned long *bytes, unsigned long *usec) | |
390 | { | |
391 | char *s, *e; | |
392 | unsigned long b, u; | |
393 | char *ratestr; | |
394 | ||
395 | /* Default to unlimited bandwidth. */ | |
396 | *bytes = ~0UL; | |
397 | *usec = 0; | |
398 | ||
399 | ratestr = xenbus_read(XBT_NIL, dev->nodename, "rate", NULL); | |
400 | if (IS_ERR(ratestr)) | |
401 | return; | |
402 | ||
403 | s = ratestr; | |
404 | b = simple_strtoul(s, &e, 10); | |
405 | if ((s == e) || (*e != ',')) | |
406 | goto fail; | |
407 | ||
408 | s = e + 1; | |
409 | u = simple_strtoul(s, &e, 10); | |
410 | if ((s == e) || (*e != '\0')) | |
411 | goto fail; | |
412 | ||
413 | *bytes = b; | |
414 | *usec = u; | |
415 | ||
416 | kfree(ratestr); | |
417 | return; | |
418 | ||
419 | fail: | |
420 | pr_warn("Failed to parse network rate limit. Traffic unlimited.\n"); | |
421 | kfree(ratestr); | |
422 | } | |
423 | ||
424 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | |
425 | { | |
426 | char *s, *e, *macstr; | |
427 | int i; | |
428 | ||
429 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | |
430 | if (IS_ERR(macstr)) | |
431 | return PTR_ERR(macstr); | |
432 | ||
433 | for (i = 0; i < ETH_ALEN; i++) { | |
434 | mac[i] = simple_strtoul(s, &e, 16); | |
435 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | |
436 | kfree(macstr); | |
437 | return -ENOENT; | |
438 | } | |
439 | s = e+1; | |
440 | } | |
441 | ||
442 | kfree(macstr); | |
443 | return 0; | |
444 | } | |
445 | ||
446 | static void unregister_hotplug_status_watch(struct backend_info *be) | |
447 | { | |
448 | if (be->have_hotplug_status_watch) { | |
449 | unregister_xenbus_watch(&be->hotplug_status_watch); | |
450 | kfree(be->hotplug_status_watch.node); | |
451 | } | |
452 | be->have_hotplug_status_watch = 0; | |
453 | } | |
454 | ||
455 | static void hotplug_status_changed(struct xenbus_watch *watch, | |
456 | const char **vec, | |
457 | unsigned int vec_size) | |
458 | { | |
459 | struct backend_info *be = container_of(watch, | |
460 | struct backend_info, | |
461 | hotplug_status_watch); | |
462 | char *str; | |
463 | unsigned int len; | |
464 | ||
465 | str = xenbus_read(XBT_NIL, be->dev->nodename, "hotplug-status", &len); | |
466 | if (IS_ERR(str)) | |
467 | return; | |
468 | if (len == sizeof("connected")-1 && !memcmp(str, "connected", len)) { | |
ea732dff PD |
469 | /* Complete any pending state change */ |
470 | xenbus_switch_state(be->dev, be->state); | |
471 | ||
f942dc25 IC |
472 | /* Not interested in this watch anymore. */ |
473 | unregister_hotplug_status_watch(be); | |
474 | } | |
475 | kfree(str); | |
476 | } | |
477 | ||
478 | static void connect(struct backend_info *be) | |
479 | { | |
480 | int err; | |
481 | struct xenbus_device *dev = be->dev; | |
482 | ||
483 | err = connect_rings(be); | |
484 | if (err) | |
485 | return; | |
486 | ||
487 | err = xen_net_read_mac(dev, be->vif->fe_dev_addr); | |
488 | if (err) { | |
489 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | |
490 | return; | |
491 | } | |
492 | ||
493 | xen_net_read_rate(dev, &be->vif->credit_bytes, | |
494 | &be->vif->credit_usec); | |
495 | be->vif->remaining_credit = be->vif->credit_bytes; | |
496 | ||
497 | unregister_hotplug_status_watch(be); | |
498 | err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch, | |
499 | hotplug_status_changed, | |
500 | "%s/%s", dev->nodename, "hotplug-status"); | |
ea732dff | 501 | if (!err) |
f942dc25 | 502 | be->have_hotplug_status_watch = 1; |
f942dc25 IC |
503 | |
504 | netif_wake_queue(be->vif->dev); | |
505 | } | |
506 | ||
507 | ||
508 | static int connect_rings(struct backend_info *be) | |
509 | { | |
510 | struct xenvif *vif = be->vif; | |
511 | struct xenbus_device *dev = be->dev; | |
512 | unsigned long tx_ring_ref, rx_ring_ref; | |
e1f00a69 | 513 | unsigned int tx_evtchn, rx_evtchn, rx_copy; |
f942dc25 IC |
514 | int err; |
515 | int val; | |
516 | ||
517 | err = xenbus_gather(XBT_NIL, dev->otherend, | |
518 | "tx-ring-ref", "%lu", &tx_ring_ref, | |
e1f00a69 | 519 | "rx-ring-ref", "%lu", &rx_ring_ref, NULL); |
f942dc25 IC |
520 | if (err) { |
521 | xenbus_dev_fatal(dev, err, | |
e1f00a69 | 522 | "reading %s/ring-ref", |
f942dc25 IC |
523 | dev->otherend); |
524 | return err; | |
525 | } | |
526 | ||
e1f00a69 WL |
527 | /* Try split event channels first, then single event channel. */ |
528 | err = xenbus_gather(XBT_NIL, dev->otherend, | |
529 | "event-channel-tx", "%u", &tx_evtchn, | |
530 | "event-channel-rx", "%u", &rx_evtchn, NULL); | |
531 | if (err < 0) { | |
532 | err = xenbus_scanf(XBT_NIL, dev->otherend, | |
533 | "event-channel", "%u", &tx_evtchn); | |
534 | if (err < 0) { | |
535 | xenbus_dev_fatal(dev, err, | |
536 | "reading %s/event-channel(-tx/rx)", | |
537 | dev->otherend); | |
538 | return err; | |
539 | } | |
540 | rx_evtchn = tx_evtchn; | |
541 | } | |
542 | ||
f942dc25 IC |
543 | err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u", |
544 | &rx_copy); | |
545 | if (err == -ENOENT) { | |
546 | err = 0; | |
547 | rx_copy = 0; | |
548 | } | |
549 | if (err < 0) { | |
550 | xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy", | |
551 | dev->otherend); | |
552 | return err; | |
553 | } | |
554 | if (!rx_copy) | |
555 | return -EOPNOTSUPP; | |
556 | ||
557 | if (vif->dev->tx_queue_len != 0) { | |
558 | if (xenbus_scanf(XBT_NIL, dev->otherend, | |
559 | "feature-rx-notify", "%d", &val) < 0) | |
560 | val = 0; | |
561 | if (val) | |
562 | vif->can_queue = 1; | |
563 | else | |
564 | /* Must be non-zero for pfifo_fast to work. */ | |
565 | vif->dev->tx_queue_len = 1; | |
566 | } | |
567 | ||
568 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg", | |
569 | "%d", &val) < 0) | |
570 | val = 0; | |
571 | vif->can_sg = !!val; | |
572 | ||
573 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4", | |
574 | "%d", &val) < 0) | |
575 | val = 0; | |
576 | vif->gso = !!val; | |
577 | ||
578 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4-prefix", | |
579 | "%d", &val) < 0) | |
580 | val = 0; | |
581 | vif->gso_prefix = !!val; | |
582 | ||
583 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload", | |
584 | "%d", &val) < 0) | |
585 | val = 0; | |
146c8a77 PD |
586 | vif->ip_csum = !val; |
587 | ||
588 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-ipv6-csum-offload", | |
589 | "%d", &val) < 0) | |
590 | val = 0; | |
591 | vif->ipv6_csum = !!val; | |
f942dc25 IC |
592 | |
593 | /* Map the shared frame, irq etc. */ | |
e1f00a69 WL |
594 | err = xenvif_connect(vif, tx_ring_ref, rx_ring_ref, |
595 | tx_evtchn, rx_evtchn); | |
f942dc25 IC |
596 | if (err) { |
597 | xenbus_dev_fatal(dev, err, | |
e1f00a69 WL |
598 | "mapping shared-frames %lu/%lu port tx %u rx %u", |
599 | tx_ring_ref, rx_ring_ref, | |
600 | tx_evtchn, rx_evtchn); | |
f942dc25 IC |
601 | return err; |
602 | } | |
603 | return 0; | |
604 | } | |
605 | ||
606 | ||
607 | /* ** Driver Registration ** */ | |
608 | ||
609 | ||
610 | static const struct xenbus_device_id netback_ids[] = { | |
611 | { "vif" }, | |
612 | { "" } | |
613 | }; | |
614 | ||
615 | ||
73db144b | 616 | static DEFINE_XENBUS_DRIVER(netback, , |
f942dc25 IC |
617 | .probe = netback_probe, |
618 | .remove = netback_remove, | |
619 | .uevent = netback_uevent, | |
620 | .otherend_changed = frontend_changed, | |
73db144b | 621 | ); |
f942dc25 IC |
622 | |
623 | int xenvif_xenbus_init(void) | |
624 | { | |
73db144b | 625 | return xenbus_register_backend(&netback_driver); |
f942dc25 | 626 | } |
b103f358 WL |
627 | |
628 | void xenvif_xenbus_fini(void) | |
629 | { | |
630 | return xenbus_unregister_driver(&netback_driver); | |
631 | } |