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" | |
e9ce7cb6 WL |
22 | #include <linux/vmalloc.h> |
23 | #include <linux/rtnetlink.h> | |
f942dc25 IC |
24 | |
25 | struct backend_info { | |
26 | struct xenbus_device *dev; | |
27 | struct xenvif *vif; | |
ea732dff PD |
28 | |
29 | /* This is the state that will be reflected in xenstore when any | |
30 | * active hotplug script completes. | |
31 | */ | |
32 | enum xenbus_state state; | |
33 | ||
f942dc25 IC |
34 | enum xenbus_state frontend_state; |
35 | struct xenbus_watch hotplug_status_watch; | |
17938a69 | 36 | u8 have_hotplug_status_watch:1; |
31a41898 IC |
37 | |
38 | const char *hotplug_script; | |
f942dc25 IC |
39 | }; |
40 | ||
4e15ee2c PD |
41 | static int connect_data_rings(struct backend_info *be, |
42 | struct xenvif_queue *queue); | |
e9ce7cb6 WL |
43 | static void connect(struct backend_info *be); |
44 | static int read_xenbus_vif_flags(struct backend_info *be); | |
2dd34339 | 45 | static int backend_create_xenvif(struct backend_info *be); |
f942dc25 | 46 | static void unregister_hotplug_status_watch(struct backend_info *be); |
edafc132 | 47 | static void xen_unregister_watchers(struct xenvif *vif); |
dc62ccac DV |
48 | static void set_backend_state(struct backend_info *be, |
49 | enum xenbus_state state); | |
f942dc25 | 50 | |
f51de243 ZK |
51 | #ifdef CONFIG_DEBUG_FS |
52 | struct dentry *xen_netback_dbg_root = NULL; | |
53 | ||
54 | static int xenvif_read_io_ring(struct seq_file *m, void *v) | |
55 | { | |
56 | struct xenvif_queue *queue = m->private; | |
57 | struct xen_netif_tx_back_ring *tx_ring = &queue->tx; | |
58 | struct xen_netif_rx_back_ring *rx_ring = &queue->rx; | |
f48da8b1 | 59 | struct netdev_queue *dev_queue; |
f51de243 ZK |
60 | |
61 | if (tx_ring->sring) { | |
62 | struct xen_netif_tx_sring *sring = tx_ring->sring; | |
63 | ||
64 | seq_printf(m, "Queue %d\nTX: nr_ents %u\n", queue->id, | |
65 | tx_ring->nr_ents); | |
66 | seq_printf(m, "req prod %u (%d) cons %u (%d) event %u (%d)\n", | |
67 | sring->req_prod, | |
68 | sring->req_prod - sring->rsp_prod, | |
69 | tx_ring->req_cons, | |
70 | tx_ring->req_cons - sring->rsp_prod, | |
71 | sring->req_event, | |
72 | sring->req_event - sring->rsp_prod); | |
73 | seq_printf(m, "rsp prod %u (base) pvt %u (%d) event %u (%d)\n", | |
74 | sring->rsp_prod, | |
75 | tx_ring->rsp_prod_pvt, | |
76 | tx_ring->rsp_prod_pvt - sring->rsp_prod, | |
77 | sring->rsp_event, | |
78 | sring->rsp_event - sring->rsp_prod); | |
79 | seq_printf(m, "pending prod %u pending cons %u nr_pending_reqs %u\n", | |
80 | queue->pending_prod, | |
81 | queue->pending_cons, | |
82 | nr_pending_reqs(queue)); | |
83 | seq_printf(m, "dealloc prod %u dealloc cons %u dealloc_queue %u\n\n", | |
84 | queue->dealloc_prod, | |
85 | queue->dealloc_cons, | |
86 | queue->dealloc_prod - queue->dealloc_cons); | |
87 | } | |
88 | ||
89 | if (rx_ring->sring) { | |
90 | struct xen_netif_rx_sring *sring = rx_ring->sring; | |
91 | ||
92 | seq_printf(m, "RX: nr_ents %u\n", rx_ring->nr_ents); | |
93 | seq_printf(m, "req prod %u (%d) cons %u (%d) event %u (%d)\n", | |
94 | sring->req_prod, | |
95 | sring->req_prod - sring->rsp_prod, | |
96 | rx_ring->req_cons, | |
97 | rx_ring->req_cons - sring->rsp_prod, | |
98 | sring->req_event, | |
99 | sring->req_event - sring->rsp_prod); | |
100 | seq_printf(m, "rsp prod %u (base) pvt %u (%d) event %u (%d)\n\n", | |
101 | sring->rsp_prod, | |
102 | rx_ring->rsp_prod_pvt, | |
103 | rx_ring->rsp_prod_pvt - sring->rsp_prod, | |
104 | sring->rsp_event, | |
105 | sring->rsp_event - sring->rsp_prod); | |
106 | } | |
107 | ||
108 | seq_printf(m, "NAPI state: %lx NAPI weight: %d TX queue len %u\n" | |
109 | "Credit timer_pending: %d, credit: %lu, usec: %lu\n" | |
110 | "remaining: %lu, expires: %lu, now: %lu\n", | |
111 | queue->napi.state, queue->napi.weight, | |
112 | skb_queue_len(&queue->tx_queue), | |
113 | timer_pending(&queue->credit_timeout), | |
114 | queue->credit_bytes, | |
115 | queue->credit_usec, | |
116 | queue->remaining_credit, | |
117 | queue->credit_timeout.expires, | |
118 | jiffies); | |
119 | ||
f48da8b1 DV |
120 | dev_queue = netdev_get_tx_queue(queue->vif->dev, queue->id); |
121 | ||
122 | seq_printf(m, "\nRx internal queue: len %u max %u pkts %u %s\n", | |
123 | queue->rx_queue_len, queue->rx_queue_max, | |
124 | skb_queue_len(&queue->rx_queue), | |
125 | netif_tx_queue_stopped(dev_queue) ? "stopped" : "running"); | |
126 | ||
f51de243 ZK |
127 | return 0; |
128 | } | |
129 | ||
130 | #define XENVIF_KICK_STR "kick" | |
5c807005 | 131 | #define BUFFER_SIZE 32 |
f51de243 ZK |
132 | |
133 | static ssize_t | |
134 | xenvif_write_io_ring(struct file *filp, const char __user *buf, size_t count, | |
135 | loff_t *ppos) | |
136 | { | |
137 | struct xenvif_queue *queue = | |
138 | ((struct seq_file *)filp->private_data)->private; | |
139 | int len; | |
5c807005 | 140 | char write[BUFFER_SIZE]; |
f51de243 ZK |
141 | |
142 | /* don't allow partial writes and check the length */ | |
143 | if (*ppos != 0) | |
144 | return 0; | |
5c807005 | 145 | if (count >= sizeof(write)) |
f51de243 ZK |
146 | return -ENOSPC; |
147 | ||
148 | len = simple_write_to_buffer(write, | |
5c807005 | 149 | sizeof(write) - 1, |
f51de243 ZK |
150 | ppos, |
151 | buf, | |
152 | count); | |
153 | if (len < 0) | |
154 | return len; | |
155 | ||
5c807005 WL |
156 | write[len] = '\0'; |
157 | ||
f51de243 ZK |
158 | if (!strncmp(write, XENVIF_KICK_STR, sizeof(XENVIF_KICK_STR) - 1)) |
159 | xenvif_interrupt(0, (void *)queue); | |
160 | else { | |
161 | pr_warn("Unknown command to io_ring_q%d. Available: kick\n", | |
162 | queue->id); | |
163 | count = -EINVAL; | |
164 | } | |
165 | return count; | |
166 | } | |
167 | ||
168 | static int xenvif_dump_open(struct inode *inode, struct file *filp) | |
169 | { | |
170 | int ret; | |
171 | void *queue = NULL; | |
172 | ||
173 | if (inode->i_private) | |
174 | queue = inode->i_private; | |
175 | ret = single_open(filp, xenvif_read_io_ring, queue); | |
176 | filp->f_mode |= FMODE_PWRITE; | |
177 | return ret; | |
178 | } | |
179 | ||
180 | static const struct file_operations xenvif_dbg_io_ring_ops_fops = { | |
181 | .owner = THIS_MODULE, | |
182 | .open = xenvif_dump_open, | |
183 | .read = seq_read, | |
184 | .llseek = seq_lseek, | |
185 | .release = single_release, | |
186 | .write = xenvif_write_io_ring, | |
187 | }; | |
188 | ||
628fa76b | 189 | static void xenvif_debugfs_addif(struct xenvif *vif) |
f51de243 ZK |
190 | { |
191 | struct dentry *pfile; | |
f51de243 ZK |
192 | int i; |
193 | ||
194 | if (IS_ERR_OR_NULL(xen_netback_dbg_root)) | |
195 | return; | |
196 | ||
197 | vif->xenvif_dbg_root = debugfs_create_dir(vif->dev->name, | |
198 | xen_netback_dbg_root); | |
199 | if (!IS_ERR_OR_NULL(vif->xenvif_dbg_root)) { | |
200 | for (i = 0; i < vif->num_queues; ++i) { | |
201 | char filename[sizeof("io_ring_q") + 4]; | |
202 | ||
203 | snprintf(filename, sizeof(filename), "io_ring_q%d", i); | |
204 | pfile = debugfs_create_file(filename, | |
205 | S_IRUSR | S_IWUSR, | |
206 | vif->xenvif_dbg_root, | |
207 | &vif->queues[i], | |
208 | &xenvif_dbg_io_ring_ops_fops); | |
209 | if (IS_ERR_OR_NULL(pfile)) | |
210 | pr_warn("Creation of io_ring file returned %ld!\n", | |
211 | PTR_ERR(pfile)); | |
212 | } | |
213 | } else | |
214 | netdev_warn(vif->dev, | |
215 | "Creation of vif debugfs dir returned %ld!\n", | |
216 | PTR_ERR(vif->xenvif_dbg_root)); | |
217 | } | |
218 | ||
219 | static void xenvif_debugfs_delif(struct xenvif *vif) | |
220 | { | |
221 | if (IS_ERR_OR_NULL(xen_netback_dbg_root)) | |
222 | return; | |
223 | ||
224 | if (!IS_ERR_OR_NULL(vif->xenvif_dbg_root)) | |
225 | debugfs_remove_recursive(vif->xenvif_dbg_root); | |
226 | vif->xenvif_dbg_root = NULL; | |
227 | } | |
228 | #endif /* CONFIG_DEBUG_FS */ | |
229 | ||
f942dc25 IC |
230 | static int netback_remove(struct xenbus_device *dev) |
231 | { | |
232 | struct backend_info *be = dev_get_drvdata(&dev->dev); | |
233 | ||
dc62ccac DV |
234 | set_backend_state(be, XenbusStateClosed); |
235 | ||
f942dc25 IC |
236 | unregister_hotplug_status_watch(be); |
237 | if (be->vif) { | |
238 | kobject_uevent(&dev->dev.kobj, KOBJ_OFFLINE); | |
edafc132 | 239 | xen_unregister_watchers(be->vif); |
f942dc25 | 240 | xenbus_rm(XBT_NIL, dev->nodename, "hotplug-status"); |
279f438e | 241 | xenvif_free(be->vif); |
f942dc25 IC |
242 | be->vif = NULL; |
243 | } | |
31a41898 | 244 | kfree(be->hotplug_script); |
f942dc25 IC |
245 | kfree(be); |
246 | dev_set_drvdata(&dev->dev, NULL); | |
247 | return 0; | |
248 | } | |
249 | ||
250 | ||
251 | /** | |
252 | * Entry point to this code when a new device is created. Allocate the basic | |
253 | * structures and switch to InitWait. | |
254 | */ | |
255 | static int netback_probe(struct xenbus_device *dev, | |
256 | const struct xenbus_device_id *id) | |
257 | { | |
258 | const char *message; | |
259 | struct xenbus_transaction xbt; | |
260 | int err; | |
261 | int sg; | |
31a41898 | 262 | const char *script; |
f942dc25 IC |
263 | struct backend_info *be = kzalloc(sizeof(struct backend_info), |
264 | GFP_KERNEL); | |
265 | if (!be) { | |
266 | xenbus_dev_fatal(dev, -ENOMEM, | |
267 | "allocating backend structure"); | |
268 | return -ENOMEM; | |
269 | } | |
270 | ||
271 | be->dev = dev; | |
272 | dev_set_drvdata(&dev->dev, be); | |
273 | ||
cce94483 FM |
274 | be->state = XenbusStateInitialising; |
275 | err = xenbus_switch_state(dev, XenbusStateInitialising); | |
276 | if (err) | |
277 | goto fail; | |
278 | ||
f942dc25 IC |
279 | sg = 1; |
280 | ||
281 | do { | |
282 | err = xenbus_transaction_start(&xbt); | |
283 | if (err) { | |
284 | xenbus_dev_fatal(dev, err, "starting transaction"); | |
285 | goto fail; | |
286 | } | |
287 | ||
288 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", sg); | |
289 | if (err) { | |
290 | message = "writing feature-sg"; | |
291 | goto abort_transaction; | |
292 | } | |
293 | ||
294 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", | |
295 | "%d", sg); | |
296 | if (err) { | |
297 | message = "writing feature-gso-tcpv4"; | |
298 | goto abort_transaction; | |
299 | } | |
300 | ||
a9468587 PD |
301 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv6", |
302 | "%d", sg); | |
303 | if (err) { | |
304 | message = "writing feature-gso-tcpv6"; | |
305 | goto abort_transaction; | |
306 | } | |
307 | ||
2eba61d5 PD |
308 | /* We support partial checksum setup for IPv6 packets */ |
309 | err = xenbus_printf(xbt, dev->nodename, | |
310 | "feature-ipv6-csum-offload", | |
311 | "%d", 1); | |
312 | if (err) { | |
313 | message = "writing feature-ipv6-csum-offload"; | |
314 | goto abort_transaction; | |
315 | } | |
316 | ||
f942dc25 IC |
317 | /* We support rx-copy path. */ |
318 | err = xenbus_printf(xbt, dev->nodename, | |
319 | "feature-rx-copy", "%d", 1); | |
320 | if (err) { | |
321 | message = "writing feature-rx-copy"; | |
322 | goto abort_transaction; | |
323 | } | |
324 | ||
325 | /* | |
326 | * We don't support rx-flip path (except old guests who don't | |
327 | * grok this feature flag). | |
328 | */ | |
329 | err = xenbus_printf(xbt, dev->nodename, | |
330 | "feature-rx-flip", "%d", 0); | |
331 | if (err) { | |
332 | message = "writing feature-rx-flip"; | |
333 | goto abort_transaction; | |
334 | } | |
335 | ||
22fae97d | 336 | /* We support dynamic multicast-control. */ |
210c34dc PD |
337 | err = xenbus_printf(xbt, dev->nodename, |
338 | "feature-multicast-control", "%d", 1); | |
339 | if (err) { | |
340 | message = "writing feature-multicast-control"; | |
341 | goto abort_transaction; | |
342 | } | |
343 | ||
22fae97d PD |
344 | err = xenbus_printf(xbt, dev->nodename, |
345 | "feature-dynamic-multicast-control", | |
346 | "%d", 1); | |
347 | if (err) { | |
348 | message = "writing feature-dynamic-multicast-control"; | |
349 | goto abort_transaction; | |
350 | } | |
351 | ||
f942dc25 IC |
352 | err = xenbus_transaction_end(xbt, 0); |
353 | } while (err == -EAGAIN); | |
354 | ||
355 | if (err) { | |
356 | xenbus_dev_fatal(dev, err, "completing transaction"); | |
357 | goto fail; | |
358 | } | |
359 | ||
e1f00a69 WL |
360 | /* |
361 | * Split event channels support, this is optional so it is not | |
362 | * put inside the above loop. | |
363 | */ | |
364 | err = xenbus_printf(XBT_NIL, dev->nodename, | |
365 | "feature-split-event-channels", | |
366 | "%u", separate_tx_rx_irq); | |
367 | if (err) | |
8ef2c3bc | 368 | pr_debug("Error writing feature-split-event-channels\n"); |
e1f00a69 | 369 | |
8d3d53b3 AB |
370 | /* Multi-queue support: This is an optional feature. */ |
371 | err = xenbus_printf(XBT_NIL, dev->nodename, | |
372 | "multi-queue-max-queues", "%u", xenvif_max_queues); | |
373 | if (err) | |
374 | pr_debug("Error writing multi-queue-max-queues\n"); | |
375 | ||
4e15ee2c PD |
376 | err = xenbus_printf(XBT_NIL, dev->nodename, |
377 | "feature-ctrl-ring", | |
378 | "%u", true); | |
379 | if (err) | |
380 | pr_debug("Error writing feature-ctrl-ring\n"); | |
381 | ||
31a41898 IC |
382 | script = xenbus_read(XBT_NIL, dev->nodename, "script", NULL); |
383 | if (IS_ERR(script)) { | |
384 | err = PTR_ERR(script); | |
385 | xenbus_dev_fatal(dev, err, "reading script"); | |
386 | goto fail; | |
387 | } | |
388 | ||
389 | be->hotplug_script = script; | |
390 | ||
ea732dff | 391 | |
f942dc25 | 392 | /* This kicks hotplug scripts, so do it immediately. */ |
2dd34339 AK |
393 | err = backend_create_xenvif(be); |
394 | if (err) | |
395 | goto fail; | |
f942dc25 IC |
396 | |
397 | return 0; | |
398 | ||
399 | abort_transaction: | |
400 | xenbus_transaction_end(xbt, 1); | |
401 | xenbus_dev_fatal(dev, err, "%s", message); | |
402 | fail: | |
8ef2c3bc | 403 | pr_debug("failed\n"); |
f942dc25 IC |
404 | netback_remove(dev); |
405 | return err; | |
406 | } | |
407 | ||
408 | ||
409 | /* | |
410 | * Handle the creation of the hotplug script environment. We add the script | |
411 | * and vif variables to the environment, for the benefit of the vif-* hotplug | |
412 | * scripts. | |
413 | */ | |
414 | static int netback_uevent(struct xenbus_device *xdev, | |
415 | struct kobj_uevent_env *env) | |
416 | { | |
417 | struct backend_info *be = dev_get_drvdata(&xdev->dev); | |
f942dc25 | 418 | |
31a41898 IC |
419 | if (!be) |
420 | return 0; | |
421 | ||
422 | if (add_uevent_var(env, "script=%s", be->hotplug_script)) | |
423 | return -ENOMEM; | |
424 | ||
425 | if (!be->vif) | |
f942dc25 IC |
426 | return 0; |
427 | ||
428 | return add_uevent_var(env, "vif=%s", be->vif->dev->name); | |
429 | } | |
430 | ||
431 | ||
2dd34339 | 432 | static int backend_create_xenvif(struct backend_info *be) |
f942dc25 IC |
433 | { |
434 | int err; | |
435 | long handle; | |
436 | struct xenbus_device *dev = be->dev; | |
f15650b7 | 437 | struct xenvif *vif; |
f942dc25 IC |
438 | |
439 | if (be->vif != NULL) | |
2dd34339 | 440 | return 0; |
f942dc25 IC |
441 | |
442 | err = xenbus_scanf(XBT_NIL, dev->nodename, "handle", "%li", &handle); | |
443 | if (err != 1) { | |
444 | xenbus_dev_fatal(dev, err, "reading handle"); | |
2dd34339 | 445 | return (err < 0) ? err : -EINVAL; |
f942dc25 IC |
446 | } |
447 | ||
f15650b7 JB |
448 | vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle); |
449 | if (IS_ERR(vif)) { | |
450 | err = PTR_ERR(vif); | |
f942dc25 | 451 | xenbus_dev_fatal(dev, err, "creating interface"); |
2dd34339 | 452 | return err; |
f942dc25 | 453 | } |
f15650b7 | 454 | be->vif = vif; |
f942dc25 IC |
455 | |
456 | kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE); | |
2dd34339 | 457 | return 0; |
f942dc25 IC |
458 | } |
459 | ||
ea732dff | 460 | static void backend_disconnect(struct backend_info *be) |
f942dc25 | 461 | { |
f51de243 | 462 | if (be->vif) { |
edafc132 | 463 | xen_unregister_watchers(be->vif); |
f51de243 ZK |
464 | #ifdef CONFIG_DEBUG_FS |
465 | xenvif_debugfs_delif(be->vif); | |
466 | #endif /* CONFIG_DEBUG_FS */ | |
4e15ee2c PD |
467 | xenvif_disconnect_data(be->vif); |
468 | xenvif_disconnect_ctrl(be->vif); | |
f51de243 | 469 | } |
279f438e PD |
470 | } |
471 | ||
ea732dff | 472 | static void backend_connect(struct backend_info *be) |
279f438e | 473 | { |
ea732dff PD |
474 | if (be->vif) |
475 | connect(be); | |
476 | } | |
279f438e | 477 | |
ea732dff PD |
478 | static inline void backend_switch_state(struct backend_info *be, |
479 | enum xenbus_state state) | |
480 | { | |
481 | struct xenbus_device *dev = be->dev; | |
482 | ||
483 | pr_debug("%s -> %s\n", dev->nodename, xenbus_strstate(state)); | |
484 | be->state = state; | |
485 | ||
486 | /* If we are waiting for a hotplug script then defer the | |
487 | * actual xenbus state change. | |
488 | */ | |
489 | if (!be->have_hotplug_status_watch) | |
490 | xenbus_switch_state(dev, state); | |
491 | } | |
492 | ||
493 | /* Handle backend state transitions: | |
494 | * | |
cce94483 | 495 | * The backend state starts in Initialising and the following transitions are |
ea732dff PD |
496 | * allowed. |
497 | * | |
cce94483 FM |
498 | * Initialising -> InitWait -> Connected |
499 | * \ | |
500 | * \ ^ \ | | |
501 | * \ | \ | | |
502 | * \ | \ | | |
503 | * \ | \ | | |
504 | * \ | \ | | |
505 | * \ | \ | | |
506 | * V | V V | |
ea732dff | 507 | * |
cce94483 | 508 | * Closed <-> Closing |
ea732dff PD |
509 | * |
510 | * The state argument specifies the eventual state of the backend and the | |
511 | * function transitions to that state via the shortest path. | |
512 | */ | |
513 | static void set_backend_state(struct backend_info *be, | |
514 | enum xenbus_state state) | |
515 | { | |
516 | while (be->state != state) { | |
517 | switch (be->state) { | |
cce94483 FM |
518 | case XenbusStateInitialising: |
519 | switch (state) { | |
520 | case XenbusStateInitWait: | |
521 | case XenbusStateConnected: | |
522 | case XenbusStateClosing: | |
523 | backend_switch_state(be, XenbusStateInitWait); | |
524 | break; | |
525 | case XenbusStateClosed: | |
526 | backend_switch_state(be, XenbusStateClosed); | |
527 | break; | |
528 | default: | |
529 | BUG(); | |
530 | } | |
531 | break; | |
ea732dff PD |
532 | case XenbusStateClosed: |
533 | switch (state) { | |
534 | case XenbusStateInitWait: | |
535 | case XenbusStateConnected: | |
ea732dff PD |
536 | backend_switch_state(be, XenbusStateInitWait); |
537 | break; | |
538 | case XenbusStateClosing: | |
539 | backend_switch_state(be, XenbusStateClosing); | |
540 | break; | |
541 | default: | |
542 | BUG(); | |
543 | } | |
544 | break; | |
545 | case XenbusStateInitWait: | |
546 | switch (state) { | |
547 | case XenbusStateConnected: | |
548 | backend_connect(be); | |
549 | backend_switch_state(be, XenbusStateConnected); | |
550 | break; | |
551 | case XenbusStateClosing: | |
552 | case XenbusStateClosed: | |
553 | backend_switch_state(be, XenbusStateClosing); | |
554 | break; | |
555 | default: | |
556 | BUG(); | |
557 | } | |
558 | break; | |
559 | case XenbusStateConnected: | |
560 | switch (state) { | |
561 | case XenbusStateInitWait: | |
562 | case XenbusStateClosing: | |
563 | case XenbusStateClosed: | |
564 | backend_disconnect(be); | |
565 | backend_switch_state(be, XenbusStateClosing); | |
566 | break; | |
567 | default: | |
568 | BUG(); | |
569 | } | |
570 | break; | |
571 | case XenbusStateClosing: | |
572 | switch (state) { | |
573 | case XenbusStateInitWait: | |
574 | case XenbusStateConnected: | |
575 | case XenbusStateClosed: | |
576 | backend_switch_state(be, XenbusStateClosed); | |
577 | break; | |
578 | default: | |
579 | BUG(); | |
580 | } | |
581 | break; | |
582 | default: | |
583 | BUG(); | |
584 | } | |
f942dc25 IC |
585 | } |
586 | } | |
587 | ||
588 | /** | |
589 | * Callback received when the frontend's state changes. | |
590 | */ | |
591 | static void frontend_changed(struct xenbus_device *dev, | |
592 | enum xenbus_state frontend_state) | |
593 | { | |
594 | struct backend_info *be = dev_get_drvdata(&dev->dev); | |
595 | ||
ea732dff | 596 | pr_debug("%s -> %s\n", dev->otherend, xenbus_strstate(frontend_state)); |
f942dc25 IC |
597 | |
598 | be->frontend_state = frontend_state; | |
599 | ||
600 | switch (frontend_state) { | |
601 | case XenbusStateInitialising: | |
ea732dff | 602 | set_backend_state(be, XenbusStateInitWait); |
f942dc25 IC |
603 | break; |
604 | ||
605 | case XenbusStateInitialised: | |
606 | break; | |
607 | ||
608 | case XenbusStateConnected: | |
ea732dff | 609 | set_backend_state(be, XenbusStateConnected); |
f942dc25 IC |
610 | break; |
611 | ||
612 | case XenbusStateClosing: | |
ea732dff | 613 | set_backend_state(be, XenbusStateClosing); |
f942dc25 IC |
614 | break; |
615 | ||
616 | case XenbusStateClosed: | |
ea732dff | 617 | set_backend_state(be, XenbusStateClosed); |
f942dc25 IC |
618 | if (xenbus_dev_is_online(dev)) |
619 | break; | |
620 | /* fall through if not online */ | |
621 | case XenbusStateUnknown: | |
ea732dff | 622 | set_backend_state(be, XenbusStateClosed); |
f942dc25 IC |
623 | device_unregister(&dev->dev); |
624 | break; | |
625 | ||
626 | default: | |
627 | xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend", | |
628 | frontend_state); | |
629 | break; | |
630 | } | |
631 | } | |
632 | ||
633 | ||
634 | static void xen_net_read_rate(struct xenbus_device *dev, | |
635 | unsigned long *bytes, unsigned long *usec) | |
636 | { | |
637 | char *s, *e; | |
638 | unsigned long b, u; | |
639 | char *ratestr; | |
640 | ||
641 | /* Default to unlimited bandwidth. */ | |
642 | *bytes = ~0UL; | |
643 | *usec = 0; | |
644 | ||
645 | ratestr = xenbus_read(XBT_NIL, dev->nodename, "rate", NULL); | |
646 | if (IS_ERR(ratestr)) | |
647 | return; | |
648 | ||
649 | s = ratestr; | |
650 | b = simple_strtoul(s, &e, 10); | |
651 | if ((s == e) || (*e != ',')) | |
652 | goto fail; | |
653 | ||
654 | s = e + 1; | |
655 | u = simple_strtoul(s, &e, 10); | |
656 | if ((s == e) || (*e != '\0')) | |
657 | goto fail; | |
658 | ||
659 | *bytes = b; | |
660 | *usec = u; | |
661 | ||
662 | kfree(ratestr); | |
663 | return; | |
664 | ||
665 | fail: | |
666 | pr_warn("Failed to parse network rate limit. Traffic unlimited.\n"); | |
667 | kfree(ratestr); | |
668 | } | |
669 | ||
670 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | |
671 | { | |
672 | char *s, *e, *macstr; | |
673 | int i; | |
674 | ||
675 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | |
676 | if (IS_ERR(macstr)) | |
677 | return PTR_ERR(macstr); | |
678 | ||
679 | for (i = 0; i < ETH_ALEN; i++) { | |
680 | mac[i] = simple_strtoul(s, &e, 16); | |
681 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | |
682 | kfree(macstr); | |
683 | return -ENOENT; | |
684 | } | |
685 | s = e+1; | |
686 | } | |
687 | ||
688 | kfree(macstr); | |
689 | return 0; | |
690 | } | |
691 | ||
edafc132 PI |
692 | static void xen_net_rate_changed(struct xenbus_watch *watch, |
693 | const char **vec, unsigned int len) | |
694 | { | |
695 | struct xenvif *vif = container_of(watch, struct xenvif, credit_watch); | |
696 | struct xenbus_device *dev = xenvif_to_xenbus_device(vif); | |
697 | unsigned long credit_bytes; | |
698 | unsigned long credit_usec; | |
699 | unsigned int queue_index; | |
700 | ||
701 | xen_net_read_rate(dev, &credit_bytes, &credit_usec); | |
702 | for (queue_index = 0; queue_index < vif->num_queues; queue_index++) { | |
703 | struct xenvif_queue *queue = &vif->queues[queue_index]; | |
704 | ||
705 | queue->credit_bytes = credit_bytes; | |
706 | queue->credit_usec = credit_usec; | |
707 | if (!mod_timer_pending(&queue->credit_timeout, jiffies) && | |
708 | queue->remaining_credit > queue->credit_bytes) { | |
709 | queue->remaining_credit = queue->credit_bytes; | |
710 | } | |
711 | } | |
712 | } | |
713 | ||
22fae97d PD |
714 | static int xen_register_credit_watch(struct xenbus_device *dev, |
715 | struct xenvif *vif) | |
edafc132 PI |
716 | { |
717 | int err = 0; | |
718 | char *node; | |
719 | unsigned maxlen = strlen(dev->nodename) + sizeof("/rate"); | |
720 | ||
12b322ac PI |
721 | if (vif->credit_watch.node) |
722 | return -EADDRINUSE; | |
723 | ||
edafc132 PI |
724 | node = kmalloc(maxlen, GFP_KERNEL); |
725 | if (!node) | |
726 | return -ENOMEM; | |
727 | snprintf(node, maxlen, "%s/rate", dev->nodename); | |
728 | vif->credit_watch.node = node; | |
729 | vif->credit_watch.callback = xen_net_rate_changed; | |
730 | err = register_xenbus_watch(&vif->credit_watch); | |
731 | if (err) { | |
732 | pr_err("Failed to set watcher %s\n", vif->credit_watch.node); | |
733 | kfree(node); | |
734 | vif->credit_watch.node = NULL; | |
735 | vif->credit_watch.callback = NULL; | |
736 | } | |
737 | return err; | |
738 | } | |
739 | ||
22fae97d | 740 | static void xen_unregister_credit_watch(struct xenvif *vif) |
edafc132 PI |
741 | { |
742 | if (vif->credit_watch.node) { | |
743 | unregister_xenbus_watch(&vif->credit_watch); | |
744 | kfree(vif->credit_watch.node); | |
745 | vif->credit_watch.node = NULL; | |
746 | } | |
747 | } | |
748 | ||
22fae97d PD |
749 | static void xen_mcast_ctrl_changed(struct xenbus_watch *watch, |
750 | const char **vec, unsigned int len) | |
751 | { | |
752 | struct xenvif *vif = container_of(watch, struct xenvif, | |
753 | mcast_ctrl_watch); | |
754 | struct xenbus_device *dev = xenvif_to_xenbus_device(vif); | |
755 | int val; | |
756 | ||
757 | if (xenbus_scanf(XBT_NIL, dev->otherend, | |
758 | "request-multicast-control", "%d", &val) < 0) | |
759 | val = 0; | |
760 | vif->multicast_control = !!val; | |
761 | } | |
762 | ||
763 | static int xen_register_mcast_ctrl_watch(struct xenbus_device *dev, | |
764 | struct xenvif *vif) | |
765 | { | |
766 | int err = 0; | |
767 | char *node; | |
768 | unsigned maxlen = strlen(dev->otherend) + | |
769 | sizeof("/request-multicast-control"); | |
770 | ||
771 | if (vif->mcast_ctrl_watch.node) { | |
772 | pr_err_ratelimited("Watch is already registered\n"); | |
773 | return -EADDRINUSE; | |
774 | } | |
775 | ||
776 | node = kmalloc(maxlen, GFP_KERNEL); | |
777 | if (!node) { | |
778 | pr_err("Failed to allocate memory for watch\n"); | |
779 | return -ENOMEM; | |
780 | } | |
781 | snprintf(node, maxlen, "%s/request-multicast-control", | |
782 | dev->otherend); | |
783 | vif->mcast_ctrl_watch.node = node; | |
784 | vif->mcast_ctrl_watch.callback = xen_mcast_ctrl_changed; | |
785 | err = register_xenbus_watch(&vif->mcast_ctrl_watch); | |
786 | if (err) { | |
787 | pr_err("Failed to set watcher %s\n", | |
788 | vif->mcast_ctrl_watch.node); | |
789 | kfree(node); | |
790 | vif->mcast_ctrl_watch.node = NULL; | |
791 | vif->mcast_ctrl_watch.callback = NULL; | |
792 | } | |
793 | return err; | |
794 | } | |
795 | ||
796 | static void xen_unregister_mcast_ctrl_watch(struct xenvif *vif) | |
797 | { | |
798 | if (vif->mcast_ctrl_watch.node) { | |
799 | unregister_xenbus_watch(&vif->mcast_ctrl_watch); | |
800 | kfree(vif->mcast_ctrl_watch.node); | |
801 | vif->mcast_ctrl_watch.node = NULL; | |
802 | } | |
803 | } | |
804 | ||
805 | static void xen_register_watchers(struct xenbus_device *dev, | |
806 | struct xenvif *vif) | |
807 | { | |
808 | xen_register_credit_watch(dev, vif); | |
809 | xen_register_mcast_ctrl_watch(dev, vif); | |
810 | } | |
811 | ||
812 | static void xen_unregister_watchers(struct xenvif *vif) | |
813 | { | |
814 | xen_unregister_mcast_ctrl_watch(vif); | |
815 | xen_unregister_credit_watch(vif); | |
816 | } | |
817 | ||
f942dc25 IC |
818 | static void unregister_hotplug_status_watch(struct backend_info *be) |
819 | { | |
820 | if (be->have_hotplug_status_watch) { | |
821 | unregister_xenbus_watch(&be->hotplug_status_watch); | |
822 | kfree(be->hotplug_status_watch.node); | |
823 | } | |
824 | be->have_hotplug_status_watch = 0; | |
825 | } | |
826 | ||
827 | static void hotplug_status_changed(struct xenbus_watch *watch, | |
828 | const char **vec, | |
829 | unsigned int vec_size) | |
830 | { | |
831 | struct backend_info *be = container_of(watch, | |
832 | struct backend_info, | |
833 | hotplug_status_watch); | |
834 | char *str; | |
835 | unsigned int len; | |
836 | ||
837 | str = xenbus_read(XBT_NIL, be->dev->nodename, "hotplug-status", &len); | |
838 | if (IS_ERR(str)) | |
839 | return; | |
840 | if (len == sizeof("connected")-1 && !memcmp(str, "connected", len)) { | |
ea732dff PD |
841 | /* Complete any pending state change */ |
842 | xenbus_switch_state(be->dev, be->state); | |
843 | ||
f942dc25 IC |
844 | /* Not interested in this watch anymore. */ |
845 | unregister_hotplug_status_watch(be); | |
846 | } | |
847 | kfree(str); | |
848 | } | |
849 | ||
4e15ee2c PD |
850 | static int connect_ctrl_ring(struct backend_info *be) |
851 | { | |
852 | struct xenbus_device *dev = be->dev; | |
853 | struct xenvif *vif = be->vif; | |
854 | unsigned int val; | |
855 | grant_ref_t ring_ref; | |
856 | unsigned int evtchn; | |
857 | int err; | |
858 | ||
859 | err = xenbus_gather(XBT_NIL, dev->otherend, | |
860 | "ctrl-ring-ref", "%u", &val, NULL); | |
861 | if (err) | |
862 | goto done; /* The frontend does not have a control ring */ | |
863 | ||
864 | ring_ref = val; | |
865 | ||
866 | err = xenbus_gather(XBT_NIL, dev->otherend, | |
867 | "event-channel-ctrl", "%u", &val, NULL); | |
868 | if (err) { | |
869 | xenbus_dev_fatal(dev, err, | |
870 | "reading %s/event-channel-ctrl", | |
871 | dev->otherend); | |
872 | goto fail; | |
873 | } | |
874 | ||
875 | evtchn = val; | |
876 | ||
877 | err = xenvif_connect_ctrl(vif, ring_ref, evtchn); | |
878 | if (err) { | |
879 | xenbus_dev_fatal(dev, err, | |
880 | "mapping shared-frame %u port %u", | |
881 | ring_ref, evtchn); | |
882 | goto fail; | |
883 | } | |
884 | ||
885 | done: | |
886 | return 0; | |
887 | ||
888 | fail: | |
889 | return err; | |
890 | } | |
891 | ||
f942dc25 IC |
892 | static void connect(struct backend_info *be) |
893 | { | |
894 | int err; | |
895 | struct xenbus_device *dev = be->dev; | |
e9ce7cb6 WL |
896 | unsigned long credit_bytes, credit_usec; |
897 | unsigned int queue_index; | |
8d3d53b3 | 898 | unsigned int requested_num_queues; |
e9ce7cb6 | 899 | struct xenvif_queue *queue; |
f942dc25 | 900 | |
8d3d53b3 AB |
901 | /* Check whether the frontend requested multiple queues |
902 | * and read the number requested. | |
903 | */ | |
904 | err = xenbus_scanf(XBT_NIL, dev->otherend, | |
905 | "multi-queue-num-queues", | |
906 | "%u", &requested_num_queues); | |
907 | if (err < 0) { | |
908 | requested_num_queues = 1; /* Fall back to single queue */ | |
909 | } else if (requested_num_queues > xenvif_max_queues) { | |
910 | /* buggy or malicious guest */ | |
911 | xenbus_dev_fatal(dev, err, | |
912 | "guest requested %u queues, exceeding the maximum of %u.", | |
913 | requested_num_queues, xenvif_max_queues); | |
914 | return; | |
915 | } | |
916 | ||
f942dc25 IC |
917 | err = xen_net_read_mac(dev, be->vif->fe_dev_addr); |
918 | if (err) { | |
919 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | |
920 | return; | |
921 | } | |
922 | ||
e9ce7cb6 | 923 | xen_net_read_rate(dev, &credit_bytes, &credit_usec); |
12b322ac | 924 | xen_unregister_watchers(be->vif); |
edafc132 | 925 | xen_register_watchers(dev, be->vif); |
e9ce7cb6 WL |
926 | read_xenbus_vif_flags(be); |
927 | ||
4e15ee2c PD |
928 | err = connect_ctrl_ring(be); |
929 | if (err) { | |
930 | xenbus_dev_fatal(dev, err, "connecting control ring"); | |
931 | return; | |
932 | } | |
933 | ||
8d3d53b3 | 934 | /* Use the number of queues requested by the frontend */ |
e9ce7cb6 WL |
935 | be->vif->queues = vzalloc(requested_num_queues * |
936 | sizeof(struct xenvif_queue)); | |
833b8f18 IY |
937 | if (!be->vif->queues) { |
938 | xenbus_dev_fatal(dev, -ENOMEM, | |
939 | "allocating queues"); | |
940 | return; | |
941 | } | |
942 | ||
f7b50c4e | 943 | be->vif->num_queues = requested_num_queues; |
ecf08d2d | 944 | be->vif->stalled_queues = requested_num_queues; |
e9ce7cb6 WL |
945 | |
946 | for (queue_index = 0; queue_index < requested_num_queues; ++queue_index) { | |
947 | queue = &be->vif->queues[queue_index]; | |
948 | queue->vif = be->vif; | |
949 | queue->id = queue_index; | |
950 | snprintf(queue->name, sizeof(queue->name), "%s-q%u", | |
951 | be->vif->dev->name, queue->id); | |
952 | ||
953 | err = xenvif_init_queue(queue); | |
8d3d53b3 AB |
954 | if (err) { |
955 | /* xenvif_init_queue() cleans up after itself on | |
956 | * failure, but we need to clean up any previously | |
957 | * initialised queues. Set num_queues to i so that | |
958 | * earlier queues can be destroyed using the regular | |
959 | * disconnect logic. | |
960 | */ | |
f7b50c4e | 961 | be->vif->num_queues = queue_index; |
e9ce7cb6 | 962 | goto err; |
8d3d53b3 | 963 | } |
e9ce7cb6 | 964 | |
ce0e5c52 | 965 | queue->credit_bytes = credit_bytes; |
e9ce7cb6 | 966 | queue->remaining_credit = credit_bytes; |
07ff890d | 967 | queue->credit_usec = credit_usec; |
e9ce7cb6 | 968 | |
4e15ee2c | 969 | err = connect_data_rings(be, queue); |
8d3d53b3 | 970 | if (err) { |
4e15ee2c PD |
971 | /* connect_data_rings() cleans up after itself on |
972 | * failure, but we need to clean up after | |
973 | * xenvif_init_queue() here, and also clean up any | |
974 | * previously initialised queues. | |
8d3d53b3 AB |
975 | */ |
976 | xenvif_deinit_queue(queue); | |
f7b50c4e | 977 | be->vif->num_queues = queue_index; |
e9ce7cb6 | 978 | goto err; |
8d3d53b3 | 979 | } |
628fa76b WL |
980 | } |
981 | ||
f51de243 | 982 | #ifdef CONFIG_DEBUG_FS |
628fa76b | 983 | xenvif_debugfs_addif(be->vif); |
f51de243 | 984 | #endif /* CONFIG_DEBUG_FS */ |
e9ce7cb6 | 985 | |
f7b50c4e WL |
986 | /* Initialisation completed, tell core driver the number of |
987 | * active queues. | |
988 | */ | |
989 | rtnl_lock(); | |
990 | netif_set_real_num_tx_queues(be->vif->dev, requested_num_queues); | |
991 | netif_set_real_num_rx_queues(be->vif->dev, requested_num_queues); | |
992 | rtnl_unlock(); | |
993 | ||
e9ce7cb6 | 994 | xenvif_carrier_on(be->vif); |
f942dc25 IC |
995 | |
996 | unregister_hotplug_status_watch(be); | |
997 | err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch, | |
998 | hotplug_status_changed, | |
999 | "%s/%s", dev->nodename, "hotplug-status"); | |
ea732dff | 1000 | if (!err) |
f942dc25 | 1001 | be->have_hotplug_status_watch = 1; |
f942dc25 | 1002 | |
e9ce7cb6 WL |
1003 | netif_tx_wake_all_queues(be->vif->dev); |
1004 | ||
1005 | return; | |
1006 | ||
1007 | err: | |
f7b50c4e | 1008 | if (be->vif->num_queues > 0) |
4e15ee2c | 1009 | xenvif_disconnect_data(be->vif); /* Clean up existing queues */ |
e9ce7cb6 WL |
1010 | vfree(be->vif->queues); |
1011 | be->vif->queues = NULL; | |
f7b50c4e | 1012 | be->vif->num_queues = 0; |
4e15ee2c | 1013 | xenvif_disconnect_ctrl(be->vif); |
e9ce7cb6 | 1014 | return; |
f942dc25 IC |
1015 | } |
1016 | ||
1017 | ||
4e15ee2c PD |
1018 | static int connect_data_rings(struct backend_info *be, |
1019 | struct xenvif_queue *queue) | |
f942dc25 | 1020 | { |
f942dc25 | 1021 | struct xenbus_device *dev = be->dev; |
f7b50c4e | 1022 | unsigned int num_queues = queue->vif->num_queues; |
f942dc25 | 1023 | unsigned long tx_ring_ref, rx_ring_ref; |
e9ce7cb6 | 1024 | unsigned int tx_evtchn, rx_evtchn; |
f942dc25 | 1025 | int err; |
8d3d53b3 AB |
1026 | char *xspath; |
1027 | size_t xspathsize; | |
1028 | const size_t xenstore_path_ext_size = 11; /* sufficient for "/queue-NNN" */ | |
1029 | ||
1030 | /* If the frontend requested 1 queue, or we have fallen back | |
1031 | * to single queue due to lack of frontend support for multi- | |
1032 | * queue, expect the remaining XenStore keys in the toplevel | |
1033 | * directory. Otherwise, expect them in a subdirectory called | |
1034 | * queue-N. | |
1035 | */ | |
1036 | if (num_queues == 1) { | |
1037 | xspath = kzalloc(strlen(dev->otherend) + 1, GFP_KERNEL); | |
1038 | if (!xspath) { | |
1039 | xenbus_dev_fatal(dev, -ENOMEM, | |
1040 | "reading ring references"); | |
1041 | return -ENOMEM; | |
1042 | } | |
1043 | strcpy(xspath, dev->otherend); | |
1044 | } else { | |
1045 | xspathsize = strlen(dev->otherend) + xenstore_path_ext_size; | |
1046 | xspath = kzalloc(xspathsize, GFP_KERNEL); | |
1047 | if (!xspath) { | |
1048 | xenbus_dev_fatal(dev, -ENOMEM, | |
1049 | "reading ring references"); | |
1050 | return -ENOMEM; | |
1051 | } | |
1052 | snprintf(xspath, xspathsize, "%s/queue-%u", dev->otherend, | |
1053 | queue->id); | |
1054 | } | |
f942dc25 | 1055 | |
8d3d53b3 | 1056 | err = xenbus_gather(XBT_NIL, xspath, |
f942dc25 | 1057 | "tx-ring-ref", "%lu", &tx_ring_ref, |
e1f00a69 | 1058 | "rx-ring-ref", "%lu", &rx_ring_ref, NULL); |
f942dc25 IC |
1059 | if (err) { |
1060 | xenbus_dev_fatal(dev, err, | |
e1f00a69 | 1061 | "reading %s/ring-ref", |
8d3d53b3 AB |
1062 | xspath); |
1063 | goto err; | |
f942dc25 IC |
1064 | } |
1065 | ||
e1f00a69 | 1066 | /* Try split event channels first, then single event channel. */ |
8d3d53b3 | 1067 | err = xenbus_gather(XBT_NIL, xspath, |
e1f00a69 WL |
1068 | "event-channel-tx", "%u", &tx_evtchn, |
1069 | "event-channel-rx", "%u", &rx_evtchn, NULL); | |
1070 | if (err < 0) { | |
8d3d53b3 | 1071 | err = xenbus_scanf(XBT_NIL, xspath, |
e1f00a69 WL |
1072 | "event-channel", "%u", &tx_evtchn); |
1073 | if (err < 0) { | |
1074 | xenbus_dev_fatal(dev, err, | |
1075 | "reading %s/event-channel(-tx/rx)", | |
8d3d53b3 AB |
1076 | xspath); |
1077 | goto err; | |
e1f00a69 WL |
1078 | } |
1079 | rx_evtchn = tx_evtchn; | |
1080 | } | |
1081 | ||
e9ce7cb6 | 1082 | /* Map the shared frame, irq etc. */ |
4e15ee2c PD |
1083 | err = xenvif_connect_data(queue, tx_ring_ref, rx_ring_ref, |
1084 | tx_evtchn, rx_evtchn); | |
e9ce7cb6 WL |
1085 | if (err) { |
1086 | xenbus_dev_fatal(dev, err, | |
1087 | "mapping shared-frames %lu/%lu port tx %u rx %u", | |
1088 | tx_ring_ref, rx_ring_ref, | |
1089 | tx_evtchn, rx_evtchn); | |
8d3d53b3 | 1090 | goto err; |
e9ce7cb6 WL |
1091 | } |
1092 | ||
8d3d53b3 AB |
1093 | err = 0; |
1094 | err: /* Regular return falls through with err == 0 */ | |
1095 | kfree(xspath); | |
1096 | return err; | |
e9ce7cb6 WL |
1097 | } |
1098 | ||
1099 | static int read_xenbus_vif_flags(struct backend_info *be) | |
1100 | { | |
1101 | struct xenvif *vif = be->vif; | |
1102 | struct xenbus_device *dev = be->dev; | |
1103 | unsigned int rx_copy; | |
1104 | int err, val; | |
1105 | ||
f942dc25 IC |
1106 | err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u", |
1107 | &rx_copy); | |
1108 | if (err == -ENOENT) { | |
1109 | err = 0; | |
1110 | rx_copy = 0; | |
1111 | } | |
1112 | if (err < 0) { | |
1113 | xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy", | |
1114 | dev->otherend); | |
1115 | return err; | |
1116 | } | |
1117 | if (!rx_copy) | |
1118 | return -EOPNOTSUPP; | |
1119 | ||
bc96f648 | 1120 | if (xenbus_scanf(XBT_NIL, dev->otherend, |
26c0e102 DV |
1121 | "feature-rx-notify", "%d", &val) < 0) |
1122 | val = 0; | |
1123 | if (!val) { | |
1124 | /* - Reduce drain timeout to poll more frequently for | |
1125 | * Rx requests. | |
1126 | * - Disable Rx stall detection. | |
1127 | */ | |
1128 | be->vif->drain_timeout = msecs_to_jiffies(30); | |
1129 | be->vif->stall_timeout = 0; | |
f942dc25 IC |
1130 | } |
1131 | ||
1132 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg", | |
1133 | "%d", &val) < 0) | |
1134 | val = 0; | |
1135 | vif->can_sg = !!val; | |
1136 | ||
82cada22 PD |
1137 | vif->gso_mask = 0; |
1138 | vif->gso_prefix_mask = 0; | |
1139 | ||
f942dc25 IC |
1140 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4", |
1141 | "%d", &val) < 0) | |
1142 | val = 0; | |
82cada22 PD |
1143 | if (val) |
1144 | vif->gso_mask |= GSO_BIT(TCPV4); | |
f942dc25 IC |
1145 | |
1146 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4-prefix", | |
1147 | "%d", &val) < 0) | |
1148 | val = 0; | |
82cada22 PD |
1149 | if (val) |
1150 | vif->gso_prefix_mask |= GSO_BIT(TCPV4); | |
1151 | ||
1152 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv6", | |
1153 | "%d", &val) < 0) | |
1154 | val = 0; | |
1155 | if (val) | |
1156 | vif->gso_mask |= GSO_BIT(TCPV6); | |
1157 | ||
1158 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv6-prefix", | |
1159 | "%d", &val) < 0) | |
1160 | val = 0; | |
1161 | if (val) | |
1162 | vif->gso_prefix_mask |= GSO_BIT(TCPV6); | |
1163 | ||
1164 | if (vif->gso_mask & vif->gso_prefix_mask) { | |
1165 | xenbus_dev_fatal(dev, err, | |
1166 | "%s: gso and gso prefix flags are not " | |
1167 | "mutually exclusive", | |
1168 | dev->otherend); | |
1169 | return -EOPNOTSUPP; | |
1170 | } | |
f942dc25 IC |
1171 | |
1172 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload", | |
1173 | "%d", &val) < 0) | |
1174 | val = 0; | |
146c8a77 PD |
1175 | vif->ip_csum = !val; |
1176 | ||
1177 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-ipv6-csum-offload", | |
1178 | "%d", &val) < 0) | |
1179 | val = 0; | |
1180 | vif->ipv6_csum = !!val; | |
f942dc25 | 1181 | |
f942dc25 IC |
1182 | return 0; |
1183 | } | |
1184 | ||
f942dc25 IC |
1185 | static const struct xenbus_device_id netback_ids[] = { |
1186 | { "vif" }, | |
1187 | { "" } | |
1188 | }; | |
1189 | ||
95afae48 DV |
1190 | static struct xenbus_driver netback_driver = { |
1191 | .ids = netback_ids, | |
f942dc25 IC |
1192 | .probe = netback_probe, |
1193 | .remove = netback_remove, | |
1194 | .uevent = netback_uevent, | |
1195 | .otherend_changed = frontend_changed, | |
95afae48 | 1196 | }; |
f942dc25 IC |
1197 | |
1198 | int xenvif_xenbus_init(void) | |
1199 | { | |
73db144b | 1200 | return xenbus_register_backend(&netback_driver); |
f942dc25 | 1201 | } |
b103f358 WL |
1202 | |
1203 | void xenvif_xenbus_fini(void) | |
1204 | { | |
1205 | return xenbus_unregister_driver(&netback_driver); | |
1206 | } |