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 | |
adf8d3ff | 18 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
f942dc25 IC |
19 | */ |
20 | ||
21 | #include "common.h" | |
22 | ||
23 | struct backend_info { | |
24 | struct xenbus_device *dev; | |
25 | struct xenvif *vif; | |
ea732dff PD |
26 | |
27 | /* This is the state that will be reflected in xenstore when any | |
28 | * active hotplug script completes. | |
29 | */ | |
30 | enum xenbus_state state; | |
31 | ||
f942dc25 IC |
32 | enum xenbus_state frontend_state; |
33 | struct xenbus_watch hotplug_status_watch; | |
17938a69 | 34 | u8 have_hotplug_status_watch:1; |
f942dc25 IC |
35 | }; |
36 | ||
37 | static int connect_rings(struct backend_info *); | |
38 | static void connect(struct backend_info *); | |
39 | static void backend_create_xenvif(struct backend_info *be); | |
40 | static void unregister_hotplug_status_watch(struct backend_info *be); | |
dc62ccac DV |
41 | static void set_backend_state(struct backend_info *be, |
42 | enum xenbus_state state); | |
f942dc25 IC |
43 | |
44 | static int netback_remove(struct xenbus_device *dev) | |
45 | { | |
46 | struct backend_info *be = dev_get_drvdata(&dev->dev); | |
47 | ||
dc62ccac DV |
48 | set_backend_state(be, XenbusStateClosed); |
49 | ||
f942dc25 IC |
50 | unregister_hotplug_status_watch(be); |
51 | if (be->vif) { | |
52 | kobject_uevent(&dev->dev.kobj, KOBJ_OFFLINE); | |
53 | xenbus_rm(XBT_NIL, dev->nodename, "hotplug-status"); | |
279f438e | 54 | xenvif_free(be->vif); |
f942dc25 IC |
55 | be->vif = NULL; |
56 | } | |
57 | kfree(be); | |
58 | dev_set_drvdata(&dev->dev, NULL); | |
59 | return 0; | |
60 | } | |
61 | ||
62 | ||
63 | /** | |
64 | * Entry point to this code when a new device is created. Allocate the basic | |
65 | * structures and switch to InitWait. | |
66 | */ | |
67 | static int netback_probe(struct xenbus_device *dev, | |
68 | const struct xenbus_device_id *id) | |
69 | { | |
70 | const char *message; | |
71 | struct xenbus_transaction xbt; | |
72 | int err; | |
73 | int sg; | |
74 | struct backend_info *be = kzalloc(sizeof(struct backend_info), | |
75 | GFP_KERNEL); | |
76 | if (!be) { | |
77 | xenbus_dev_fatal(dev, -ENOMEM, | |
78 | "allocating backend structure"); | |
79 | return -ENOMEM; | |
80 | } | |
81 | ||
82 | be->dev = dev; | |
83 | dev_set_drvdata(&dev->dev, be); | |
84 | ||
85 | sg = 1; | |
86 | ||
87 | do { | |
88 | err = xenbus_transaction_start(&xbt); | |
89 | if (err) { | |
90 | xenbus_dev_fatal(dev, err, "starting transaction"); | |
91 | goto fail; | |
92 | } | |
93 | ||
94 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", sg); | |
95 | if (err) { | |
96 | message = "writing feature-sg"; | |
97 | goto abort_transaction; | |
98 | } | |
99 | ||
100 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", | |
101 | "%d", sg); | |
102 | if (err) { | |
103 | message = "writing feature-gso-tcpv4"; | |
104 | goto abort_transaction; | |
105 | } | |
106 | ||
a9468587 PD |
107 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv6", |
108 | "%d", sg); | |
109 | if (err) { | |
110 | message = "writing feature-gso-tcpv6"; | |
111 | goto abort_transaction; | |
112 | } | |
113 | ||
2eba61d5 PD |
114 | /* We support partial checksum setup for IPv6 packets */ |
115 | err = xenbus_printf(xbt, dev->nodename, | |
116 | "feature-ipv6-csum-offload", | |
117 | "%d", 1); | |
118 | if (err) { | |
119 | message = "writing feature-ipv6-csum-offload"; | |
120 | goto abort_transaction; | |
121 | } | |
122 | ||
f942dc25 IC |
123 | /* We support rx-copy path. */ |
124 | err = xenbus_printf(xbt, dev->nodename, | |
125 | "feature-rx-copy", "%d", 1); | |
126 | if (err) { | |
127 | message = "writing feature-rx-copy"; | |
128 | goto abort_transaction; | |
129 | } | |
130 | ||
131 | /* | |
132 | * We don't support rx-flip path (except old guests who don't | |
133 | * grok this feature flag). | |
134 | */ | |
135 | err = xenbus_printf(xbt, dev->nodename, | |
136 | "feature-rx-flip", "%d", 0); | |
137 | if (err) { | |
138 | message = "writing feature-rx-flip"; | |
139 | goto abort_transaction; | |
140 | } | |
141 | ||
142 | err = xenbus_transaction_end(xbt, 0); | |
143 | } while (err == -EAGAIN); | |
144 | ||
145 | if (err) { | |
146 | xenbus_dev_fatal(dev, err, "completing transaction"); | |
147 | goto fail; | |
148 | } | |
149 | ||
e1f00a69 WL |
150 | /* |
151 | * Split event channels support, this is optional so it is not | |
152 | * put inside the above loop. | |
153 | */ | |
154 | err = xenbus_printf(XBT_NIL, dev->nodename, | |
155 | "feature-split-event-channels", | |
156 | "%u", separate_tx_rx_irq); | |
157 | if (err) | |
8ef2c3bc | 158 | pr_debug("Error writing feature-split-event-channels\n"); |
e1f00a69 | 159 | |
f942dc25 IC |
160 | err = xenbus_switch_state(dev, XenbusStateInitWait); |
161 | if (err) | |
162 | goto fail; | |
163 | ||
ea732dff PD |
164 | be->state = XenbusStateInitWait; |
165 | ||
f942dc25 IC |
166 | /* This kicks hotplug scripts, so do it immediately. */ |
167 | backend_create_xenvif(be); | |
168 | ||
169 | return 0; | |
170 | ||
171 | abort_transaction: | |
172 | xenbus_transaction_end(xbt, 1); | |
173 | xenbus_dev_fatal(dev, err, "%s", message); | |
174 | fail: | |
8ef2c3bc | 175 | pr_debug("failed\n"); |
f942dc25 IC |
176 | netback_remove(dev); |
177 | return err; | |
178 | } | |
179 | ||
180 | ||
181 | /* | |
182 | * Handle the creation of the hotplug script environment. We add the script | |
183 | * and vif variables to the environment, for the benefit of the vif-* hotplug | |
184 | * scripts. | |
185 | */ | |
186 | static int netback_uevent(struct xenbus_device *xdev, | |
187 | struct kobj_uevent_env *env) | |
188 | { | |
189 | struct backend_info *be = dev_get_drvdata(&xdev->dev); | |
190 | char *val; | |
191 | ||
192 | val = xenbus_read(XBT_NIL, xdev->nodename, "script", NULL); | |
193 | if (IS_ERR(val)) { | |
194 | int err = PTR_ERR(val); | |
195 | xenbus_dev_fatal(xdev, err, "reading script"); | |
196 | return err; | |
197 | } else { | |
198 | if (add_uevent_var(env, "script=%s", val)) { | |
199 | kfree(val); | |
200 | return -ENOMEM; | |
201 | } | |
202 | kfree(val); | |
203 | } | |
204 | ||
205 | if (!be || !be->vif) | |
206 | return 0; | |
207 | ||
208 | return add_uevent_var(env, "vif=%s", be->vif->dev->name); | |
209 | } | |
210 | ||
211 | ||
212 | static void backend_create_xenvif(struct backend_info *be) | |
213 | { | |
214 | int err; | |
215 | long handle; | |
216 | struct xenbus_device *dev = be->dev; | |
217 | ||
218 | if (be->vif != NULL) | |
219 | return; | |
220 | ||
221 | err = xenbus_scanf(XBT_NIL, dev->nodename, "handle", "%li", &handle); | |
222 | if (err != 1) { | |
223 | xenbus_dev_fatal(dev, err, "reading handle"); | |
224 | return; | |
225 | } | |
226 | ||
227 | be->vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle); | |
228 | if (IS_ERR(be->vif)) { | |
229 | err = PTR_ERR(be->vif); | |
230 | be->vif = NULL; | |
231 | xenbus_dev_fatal(dev, err, "creating interface"); | |
232 | return; | |
233 | } | |
234 | ||
235 | kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE); | |
236 | } | |
237 | ||
ea732dff | 238 | static void backend_disconnect(struct backend_info *be) |
f942dc25 | 239 | { |
279f438e PD |
240 | if (be->vif) |
241 | xenvif_disconnect(be->vif); | |
242 | } | |
243 | ||
ea732dff | 244 | static void backend_connect(struct backend_info *be) |
279f438e | 245 | { |
ea732dff PD |
246 | if (be->vif) |
247 | connect(be); | |
248 | } | |
279f438e | 249 | |
ea732dff PD |
250 | static inline void backend_switch_state(struct backend_info *be, |
251 | enum xenbus_state state) | |
252 | { | |
253 | struct xenbus_device *dev = be->dev; | |
254 | ||
255 | pr_debug("%s -> %s\n", dev->nodename, xenbus_strstate(state)); | |
256 | be->state = state; | |
257 | ||
258 | /* If we are waiting for a hotplug script then defer the | |
259 | * actual xenbus state change. | |
260 | */ | |
261 | if (!be->have_hotplug_status_watch) | |
262 | xenbus_switch_state(dev, state); | |
263 | } | |
264 | ||
265 | /* Handle backend state transitions: | |
266 | * | |
267 | * The backend state starts in InitWait and the following transitions are | |
268 | * allowed. | |
269 | * | |
270 | * InitWait -> Connected | |
271 | * | |
272 | * ^ \ | | |
273 | * | \ | | |
274 | * | \ | | |
275 | * | \ | | |
276 | * | \ | | |
277 | * | \ | | |
278 | * | V V | |
279 | * | |
280 | * Closed <-> Closing | |
281 | * | |
282 | * The state argument specifies the eventual state of the backend and the | |
283 | * function transitions to that state via the shortest path. | |
284 | */ | |
285 | static void set_backend_state(struct backend_info *be, | |
286 | enum xenbus_state state) | |
287 | { | |
288 | while (be->state != state) { | |
289 | switch (be->state) { | |
290 | case XenbusStateClosed: | |
291 | switch (state) { | |
292 | case XenbusStateInitWait: | |
293 | case XenbusStateConnected: | |
294 | pr_info("%s: prepare for reconnect\n", | |
295 | be->dev->nodename); | |
296 | backend_switch_state(be, XenbusStateInitWait); | |
297 | break; | |
298 | case XenbusStateClosing: | |
299 | backend_switch_state(be, XenbusStateClosing); | |
300 | break; | |
301 | default: | |
302 | BUG(); | |
303 | } | |
304 | break; | |
305 | case XenbusStateInitWait: | |
306 | switch (state) { | |
307 | case XenbusStateConnected: | |
308 | backend_connect(be); | |
309 | backend_switch_state(be, XenbusStateConnected); | |
310 | break; | |
311 | case XenbusStateClosing: | |
312 | case XenbusStateClosed: | |
313 | backend_switch_state(be, XenbusStateClosing); | |
314 | break; | |
315 | default: | |
316 | BUG(); | |
317 | } | |
318 | break; | |
319 | case XenbusStateConnected: | |
320 | switch (state) { | |
321 | case XenbusStateInitWait: | |
322 | case XenbusStateClosing: | |
323 | case XenbusStateClosed: | |
324 | backend_disconnect(be); | |
325 | backend_switch_state(be, XenbusStateClosing); | |
326 | break; | |
327 | default: | |
328 | BUG(); | |
329 | } | |
330 | break; | |
331 | case XenbusStateClosing: | |
332 | switch (state) { | |
333 | case XenbusStateInitWait: | |
334 | case XenbusStateConnected: | |
335 | case XenbusStateClosed: | |
336 | backend_switch_state(be, XenbusStateClosed); | |
337 | break; | |
338 | default: | |
339 | BUG(); | |
340 | } | |
341 | break; | |
342 | default: | |
343 | BUG(); | |
344 | } | |
f942dc25 IC |
345 | } |
346 | } | |
347 | ||
348 | /** | |
349 | * Callback received when the frontend's state changes. | |
350 | */ | |
351 | static void frontend_changed(struct xenbus_device *dev, | |
352 | enum xenbus_state frontend_state) | |
353 | { | |
354 | struct backend_info *be = dev_get_drvdata(&dev->dev); | |
355 | ||
ea732dff | 356 | pr_debug("%s -> %s\n", dev->otherend, xenbus_strstate(frontend_state)); |
f942dc25 IC |
357 | |
358 | be->frontend_state = frontend_state; | |
359 | ||
360 | switch (frontend_state) { | |
361 | case XenbusStateInitialising: | |
ea732dff | 362 | set_backend_state(be, XenbusStateInitWait); |
f942dc25 IC |
363 | break; |
364 | ||
365 | case XenbusStateInitialised: | |
366 | break; | |
367 | ||
368 | case XenbusStateConnected: | |
ea732dff | 369 | set_backend_state(be, XenbusStateConnected); |
f942dc25 IC |
370 | break; |
371 | ||
372 | case XenbusStateClosing: | |
ea732dff | 373 | set_backend_state(be, XenbusStateClosing); |
f942dc25 IC |
374 | break; |
375 | ||
376 | case XenbusStateClosed: | |
ea732dff | 377 | set_backend_state(be, XenbusStateClosed); |
f942dc25 IC |
378 | if (xenbus_dev_is_online(dev)) |
379 | break; | |
380 | /* fall through if not online */ | |
381 | case XenbusStateUnknown: | |
ea732dff | 382 | set_backend_state(be, XenbusStateClosed); |
f942dc25 IC |
383 | device_unregister(&dev->dev); |
384 | break; | |
385 | ||
386 | default: | |
387 | xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend", | |
388 | frontend_state); | |
389 | break; | |
390 | } | |
391 | } | |
392 | ||
393 | ||
394 | static void xen_net_read_rate(struct xenbus_device *dev, | |
395 | unsigned long *bytes, unsigned long *usec) | |
396 | { | |
397 | char *s, *e; | |
398 | unsigned long b, u; | |
399 | char *ratestr; | |
400 | ||
401 | /* Default to unlimited bandwidth. */ | |
402 | *bytes = ~0UL; | |
403 | *usec = 0; | |
404 | ||
405 | ratestr = xenbus_read(XBT_NIL, dev->nodename, "rate", NULL); | |
406 | if (IS_ERR(ratestr)) | |
407 | return; | |
408 | ||
409 | s = ratestr; | |
410 | b = simple_strtoul(s, &e, 10); | |
411 | if ((s == e) || (*e != ',')) | |
412 | goto fail; | |
413 | ||
414 | s = e + 1; | |
415 | u = simple_strtoul(s, &e, 10); | |
416 | if ((s == e) || (*e != '\0')) | |
417 | goto fail; | |
418 | ||
419 | *bytes = b; | |
420 | *usec = u; | |
421 | ||
422 | kfree(ratestr); | |
423 | return; | |
424 | ||
425 | fail: | |
426 | pr_warn("Failed to parse network rate limit. Traffic unlimited.\n"); | |
427 | kfree(ratestr); | |
428 | } | |
429 | ||
430 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | |
431 | { | |
432 | char *s, *e, *macstr; | |
433 | int i; | |
434 | ||
435 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | |
436 | if (IS_ERR(macstr)) | |
437 | return PTR_ERR(macstr); | |
438 | ||
439 | for (i = 0; i < ETH_ALEN; i++) { | |
440 | mac[i] = simple_strtoul(s, &e, 16); | |
441 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | |
442 | kfree(macstr); | |
443 | return -ENOENT; | |
444 | } | |
445 | s = e+1; | |
446 | } | |
447 | ||
448 | kfree(macstr); | |
449 | return 0; | |
450 | } | |
451 | ||
452 | static void unregister_hotplug_status_watch(struct backend_info *be) | |
453 | { | |
454 | if (be->have_hotplug_status_watch) { | |
455 | unregister_xenbus_watch(&be->hotplug_status_watch); | |
456 | kfree(be->hotplug_status_watch.node); | |
457 | } | |
458 | be->have_hotplug_status_watch = 0; | |
459 | } | |
460 | ||
461 | static void hotplug_status_changed(struct xenbus_watch *watch, | |
462 | const char **vec, | |
463 | unsigned int vec_size) | |
464 | { | |
465 | struct backend_info *be = container_of(watch, | |
466 | struct backend_info, | |
467 | hotplug_status_watch); | |
468 | char *str; | |
469 | unsigned int len; | |
470 | ||
471 | str = xenbus_read(XBT_NIL, be->dev->nodename, "hotplug-status", &len); | |
472 | if (IS_ERR(str)) | |
473 | return; | |
474 | if (len == sizeof("connected")-1 && !memcmp(str, "connected", len)) { | |
ea732dff PD |
475 | /* Complete any pending state change */ |
476 | xenbus_switch_state(be->dev, be->state); | |
477 | ||
f942dc25 IC |
478 | /* Not interested in this watch anymore. */ |
479 | unregister_hotplug_status_watch(be); | |
480 | } | |
481 | kfree(str); | |
482 | } | |
483 | ||
484 | static void connect(struct backend_info *be) | |
485 | { | |
486 | int err; | |
487 | struct xenbus_device *dev = be->dev; | |
488 | ||
489 | err = connect_rings(be); | |
490 | if (err) | |
491 | return; | |
492 | ||
493 | err = xen_net_read_mac(dev, be->vif->fe_dev_addr); | |
494 | if (err) { | |
495 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | |
496 | return; | |
497 | } | |
498 | ||
499 | xen_net_read_rate(dev, &be->vif->credit_bytes, | |
500 | &be->vif->credit_usec); | |
501 | be->vif->remaining_credit = be->vif->credit_bytes; | |
502 | ||
503 | unregister_hotplug_status_watch(be); | |
504 | err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch, | |
505 | hotplug_status_changed, | |
506 | "%s/%s", dev->nodename, "hotplug-status"); | |
ea732dff | 507 | if (!err) |
f942dc25 | 508 | be->have_hotplug_status_watch = 1; |
f942dc25 IC |
509 | |
510 | netif_wake_queue(be->vif->dev); | |
511 | } | |
512 | ||
513 | ||
514 | static int connect_rings(struct backend_info *be) | |
515 | { | |
516 | struct xenvif *vif = be->vif; | |
517 | struct xenbus_device *dev = be->dev; | |
518 | unsigned long tx_ring_ref, rx_ring_ref; | |
e1f00a69 | 519 | unsigned int tx_evtchn, rx_evtchn, rx_copy; |
f942dc25 IC |
520 | int err; |
521 | int val; | |
522 | ||
523 | err = xenbus_gather(XBT_NIL, dev->otherend, | |
524 | "tx-ring-ref", "%lu", &tx_ring_ref, | |
e1f00a69 | 525 | "rx-ring-ref", "%lu", &rx_ring_ref, NULL); |
f942dc25 IC |
526 | if (err) { |
527 | xenbus_dev_fatal(dev, err, | |
e1f00a69 | 528 | "reading %s/ring-ref", |
f942dc25 IC |
529 | dev->otherend); |
530 | return err; | |
531 | } | |
532 | ||
e1f00a69 WL |
533 | /* Try split event channels first, then single event channel. */ |
534 | err = xenbus_gather(XBT_NIL, dev->otherend, | |
535 | "event-channel-tx", "%u", &tx_evtchn, | |
536 | "event-channel-rx", "%u", &rx_evtchn, NULL); | |
537 | if (err < 0) { | |
538 | err = xenbus_scanf(XBT_NIL, dev->otherend, | |
539 | "event-channel", "%u", &tx_evtchn); | |
540 | if (err < 0) { | |
541 | xenbus_dev_fatal(dev, err, | |
542 | "reading %s/event-channel(-tx/rx)", | |
543 | dev->otherend); | |
544 | return err; | |
545 | } | |
546 | rx_evtchn = tx_evtchn; | |
547 | } | |
548 | ||
f942dc25 IC |
549 | err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u", |
550 | &rx_copy); | |
551 | if (err == -ENOENT) { | |
552 | err = 0; | |
553 | rx_copy = 0; | |
554 | } | |
555 | if (err < 0) { | |
556 | xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy", | |
557 | dev->otherend); | |
558 | return err; | |
559 | } | |
560 | if (!rx_copy) | |
561 | return -EOPNOTSUPP; | |
562 | ||
563 | if (vif->dev->tx_queue_len != 0) { | |
564 | if (xenbus_scanf(XBT_NIL, dev->otherend, | |
565 | "feature-rx-notify", "%d", &val) < 0) | |
566 | val = 0; | |
567 | if (val) | |
568 | vif->can_queue = 1; | |
569 | else | |
570 | /* Must be non-zero for pfifo_fast to work. */ | |
571 | vif->dev->tx_queue_len = 1; | |
572 | } | |
573 | ||
574 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg", | |
575 | "%d", &val) < 0) | |
576 | val = 0; | |
577 | vif->can_sg = !!val; | |
578 | ||
82cada22 PD |
579 | vif->gso_mask = 0; |
580 | vif->gso_prefix_mask = 0; | |
581 | ||
f942dc25 IC |
582 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4", |
583 | "%d", &val) < 0) | |
584 | val = 0; | |
82cada22 PD |
585 | if (val) |
586 | vif->gso_mask |= GSO_BIT(TCPV4); | |
f942dc25 IC |
587 | |
588 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4-prefix", | |
589 | "%d", &val) < 0) | |
590 | val = 0; | |
82cada22 PD |
591 | if (val) |
592 | vif->gso_prefix_mask |= GSO_BIT(TCPV4); | |
593 | ||
594 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv6", | |
595 | "%d", &val) < 0) | |
596 | val = 0; | |
597 | if (val) | |
598 | vif->gso_mask |= GSO_BIT(TCPV6); | |
599 | ||
600 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv6-prefix", | |
601 | "%d", &val) < 0) | |
602 | val = 0; | |
603 | if (val) | |
604 | vif->gso_prefix_mask |= GSO_BIT(TCPV6); | |
605 | ||
606 | if (vif->gso_mask & vif->gso_prefix_mask) { | |
607 | xenbus_dev_fatal(dev, err, | |
608 | "%s: gso and gso prefix flags are not " | |
609 | "mutually exclusive", | |
610 | dev->otherend); | |
611 | return -EOPNOTSUPP; | |
612 | } | |
f942dc25 IC |
613 | |
614 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload", | |
615 | "%d", &val) < 0) | |
616 | val = 0; | |
146c8a77 PD |
617 | vif->ip_csum = !val; |
618 | ||
619 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-ipv6-csum-offload", | |
620 | "%d", &val) < 0) | |
621 | val = 0; | |
622 | vif->ipv6_csum = !!val; | |
f942dc25 IC |
623 | |
624 | /* Map the shared frame, irq etc. */ | |
e1f00a69 WL |
625 | err = xenvif_connect(vif, tx_ring_ref, rx_ring_ref, |
626 | tx_evtchn, rx_evtchn); | |
f942dc25 IC |
627 | if (err) { |
628 | xenbus_dev_fatal(dev, err, | |
e1f00a69 WL |
629 | "mapping shared-frames %lu/%lu port tx %u rx %u", |
630 | tx_ring_ref, rx_ring_ref, | |
631 | tx_evtchn, rx_evtchn); | |
f942dc25 IC |
632 | return err; |
633 | } | |
634 | return 0; | |
635 | } | |
636 | ||
637 | ||
638 | /* ** Driver Registration ** */ | |
639 | ||
640 | ||
641 | static const struct xenbus_device_id netback_ids[] = { | |
642 | { "vif" }, | |
643 | { "" } | |
644 | }; | |
645 | ||
646 | ||
73db144b | 647 | static DEFINE_XENBUS_DRIVER(netback, , |
f942dc25 IC |
648 | .probe = netback_probe, |
649 | .remove = netback_remove, | |
650 | .uevent = netback_uevent, | |
651 | .otherend_changed = frontend_changed, | |
73db144b | 652 | ); |
f942dc25 IC |
653 | |
654 | int xenvif_xenbus_init(void) | |
655 | { | |
73db144b | 656 | return xenbus_register_backend(&netback_driver); |
f942dc25 | 657 | } |
b103f358 WL |
658 | |
659 | void xenvif_xenbus_fini(void) | |
660 | { | |
661 | return xenbus_unregister_driver(&netback_driver); | |
662 | } |