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 | ||
a9339b8e | 168 | static int xenvif_io_ring_open(struct inode *inode, struct file *filp) |
f51de243 ZK |
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, | |
a9339b8e | 182 | .open = xenvif_io_ring_open, |
f51de243 ZK |
183 | .read = seq_read, |
184 | .llseek = seq_lseek, | |
185 | .release = single_release, | |
186 | .write = xenvif_write_io_ring, | |
187 | }; | |
188 | ||
a9339b8e PD |
189 | static int xenvif_read_ctrl(struct seq_file *m, void *v) |
190 | { | |
191 | struct xenvif *vif = m->private; | |
192 | ||
193 | xenvif_dump_hash_info(vif, m); | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static int xenvif_ctrl_open(struct inode *inode, struct file *filp) | |
199 | { | |
200 | return single_open(filp, xenvif_read_ctrl, inode->i_private); | |
201 | } | |
202 | ||
203 | static const struct file_operations xenvif_dbg_ctrl_ops_fops = { | |
204 | .owner = THIS_MODULE, | |
205 | .open = xenvif_ctrl_open, | |
206 | .read = seq_read, | |
207 | .llseek = seq_lseek, | |
208 | .release = single_release, | |
209 | }; | |
210 | ||
628fa76b | 211 | static void xenvif_debugfs_addif(struct xenvif *vif) |
f51de243 ZK |
212 | { |
213 | struct dentry *pfile; | |
f51de243 ZK |
214 | int i; |
215 | ||
216 | if (IS_ERR_OR_NULL(xen_netback_dbg_root)) | |
217 | return; | |
218 | ||
219 | vif->xenvif_dbg_root = debugfs_create_dir(vif->dev->name, | |
220 | xen_netback_dbg_root); | |
221 | if (!IS_ERR_OR_NULL(vif->xenvif_dbg_root)) { | |
222 | for (i = 0; i < vif->num_queues; ++i) { | |
223 | char filename[sizeof("io_ring_q") + 4]; | |
224 | ||
225 | snprintf(filename, sizeof(filename), "io_ring_q%d", i); | |
226 | pfile = debugfs_create_file(filename, | |
227 | S_IRUSR | S_IWUSR, | |
228 | vif->xenvif_dbg_root, | |
229 | &vif->queues[i], | |
230 | &xenvif_dbg_io_ring_ops_fops); | |
231 | if (IS_ERR_OR_NULL(pfile)) | |
232 | pr_warn("Creation of io_ring file returned %ld!\n", | |
233 | PTR_ERR(pfile)); | |
234 | } | |
a9339b8e PD |
235 | |
236 | if (vif->ctrl_irq) { | |
237 | pfile = debugfs_create_file("ctrl", | |
238 | S_IRUSR, | |
239 | vif->xenvif_dbg_root, | |
240 | vif, | |
241 | &xenvif_dbg_ctrl_ops_fops); | |
242 | if (IS_ERR_OR_NULL(pfile)) | |
243 | pr_warn("Creation of ctrl file returned %ld!\n", | |
244 | PTR_ERR(pfile)); | |
245 | } | |
f51de243 ZK |
246 | } else |
247 | netdev_warn(vif->dev, | |
248 | "Creation of vif debugfs dir returned %ld!\n", | |
249 | PTR_ERR(vif->xenvif_dbg_root)); | |
250 | } | |
251 | ||
252 | static void xenvif_debugfs_delif(struct xenvif *vif) | |
253 | { | |
254 | if (IS_ERR_OR_NULL(xen_netback_dbg_root)) | |
255 | return; | |
256 | ||
257 | if (!IS_ERR_OR_NULL(vif->xenvif_dbg_root)) | |
258 | debugfs_remove_recursive(vif->xenvif_dbg_root); | |
259 | vif->xenvif_dbg_root = NULL; | |
260 | } | |
261 | #endif /* CONFIG_DEBUG_FS */ | |
262 | ||
f942dc25 IC |
263 | static int netback_remove(struct xenbus_device *dev) |
264 | { | |
265 | struct backend_info *be = dev_get_drvdata(&dev->dev); | |
266 | ||
dc62ccac DV |
267 | set_backend_state(be, XenbusStateClosed); |
268 | ||
f942dc25 IC |
269 | unregister_hotplug_status_watch(be); |
270 | if (be->vif) { | |
271 | kobject_uevent(&dev->dev.kobj, KOBJ_OFFLINE); | |
edafc132 | 272 | xen_unregister_watchers(be->vif); |
f942dc25 | 273 | xenbus_rm(XBT_NIL, dev->nodename, "hotplug-status"); |
279f438e | 274 | xenvif_free(be->vif); |
f942dc25 IC |
275 | be->vif = NULL; |
276 | } | |
31a41898 | 277 | kfree(be->hotplug_script); |
f942dc25 IC |
278 | kfree(be); |
279 | dev_set_drvdata(&dev->dev, NULL); | |
280 | return 0; | |
281 | } | |
282 | ||
283 | ||
284 | /** | |
285 | * Entry point to this code when a new device is created. Allocate the basic | |
286 | * structures and switch to InitWait. | |
287 | */ | |
288 | static int netback_probe(struct xenbus_device *dev, | |
289 | const struct xenbus_device_id *id) | |
290 | { | |
291 | const char *message; | |
292 | struct xenbus_transaction xbt; | |
293 | int err; | |
294 | int sg; | |
31a41898 | 295 | const char *script; |
f942dc25 IC |
296 | struct backend_info *be = kzalloc(sizeof(struct backend_info), |
297 | GFP_KERNEL); | |
298 | if (!be) { | |
299 | xenbus_dev_fatal(dev, -ENOMEM, | |
300 | "allocating backend structure"); | |
301 | return -ENOMEM; | |
302 | } | |
303 | ||
304 | be->dev = dev; | |
305 | dev_set_drvdata(&dev->dev, be); | |
306 | ||
cce94483 FM |
307 | be->state = XenbusStateInitialising; |
308 | err = xenbus_switch_state(dev, XenbusStateInitialising); | |
309 | if (err) | |
310 | goto fail; | |
311 | ||
f942dc25 IC |
312 | sg = 1; |
313 | ||
314 | do { | |
315 | err = xenbus_transaction_start(&xbt); | |
316 | if (err) { | |
317 | xenbus_dev_fatal(dev, err, "starting transaction"); | |
318 | goto fail; | |
319 | } | |
320 | ||
321 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", sg); | |
322 | if (err) { | |
323 | message = "writing feature-sg"; | |
324 | goto abort_transaction; | |
325 | } | |
326 | ||
327 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", | |
328 | "%d", sg); | |
329 | if (err) { | |
330 | message = "writing feature-gso-tcpv4"; | |
331 | goto abort_transaction; | |
332 | } | |
333 | ||
a9468587 PD |
334 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv6", |
335 | "%d", sg); | |
336 | if (err) { | |
337 | message = "writing feature-gso-tcpv6"; | |
338 | goto abort_transaction; | |
339 | } | |
340 | ||
2eba61d5 PD |
341 | /* We support partial checksum setup for IPv6 packets */ |
342 | err = xenbus_printf(xbt, dev->nodename, | |
343 | "feature-ipv6-csum-offload", | |
344 | "%d", 1); | |
345 | if (err) { | |
346 | message = "writing feature-ipv6-csum-offload"; | |
347 | goto abort_transaction; | |
348 | } | |
349 | ||
f942dc25 IC |
350 | /* We support rx-copy path. */ |
351 | err = xenbus_printf(xbt, dev->nodename, | |
352 | "feature-rx-copy", "%d", 1); | |
353 | if (err) { | |
354 | message = "writing feature-rx-copy"; | |
355 | goto abort_transaction; | |
356 | } | |
357 | ||
358 | /* | |
359 | * We don't support rx-flip path (except old guests who don't | |
360 | * grok this feature flag). | |
361 | */ | |
362 | err = xenbus_printf(xbt, dev->nodename, | |
363 | "feature-rx-flip", "%d", 0); | |
364 | if (err) { | |
365 | message = "writing feature-rx-flip"; | |
366 | goto abort_transaction; | |
367 | } | |
368 | ||
22fae97d | 369 | /* We support dynamic multicast-control. */ |
210c34dc PD |
370 | err = xenbus_printf(xbt, dev->nodename, |
371 | "feature-multicast-control", "%d", 1); | |
372 | if (err) { | |
373 | message = "writing feature-multicast-control"; | |
374 | goto abort_transaction; | |
375 | } | |
376 | ||
22fae97d PD |
377 | err = xenbus_printf(xbt, dev->nodename, |
378 | "feature-dynamic-multicast-control", | |
379 | "%d", 1); | |
380 | if (err) { | |
381 | message = "writing feature-dynamic-multicast-control"; | |
382 | goto abort_transaction; | |
383 | } | |
384 | ||
f942dc25 IC |
385 | err = xenbus_transaction_end(xbt, 0); |
386 | } while (err == -EAGAIN); | |
387 | ||
388 | if (err) { | |
389 | xenbus_dev_fatal(dev, err, "completing transaction"); | |
390 | goto fail; | |
391 | } | |
392 | ||
e1f00a69 WL |
393 | /* |
394 | * Split event channels support, this is optional so it is not | |
395 | * put inside the above loop. | |
396 | */ | |
397 | err = xenbus_printf(XBT_NIL, dev->nodename, | |
398 | "feature-split-event-channels", | |
399 | "%u", separate_tx_rx_irq); | |
400 | if (err) | |
8ef2c3bc | 401 | pr_debug("Error writing feature-split-event-channels\n"); |
e1f00a69 | 402 | |
8d3d53b3 AB |
403 | /* Multi-queue support: This is an optional feature. */ |
404 | err = xenbus_printf(XBT_NIL, dev->nodename, | |
405 | "multi-queue-max-queues", "%u", xenvif_max_queues); | |
406 | if (err) | |
407 | pr_debug("Error writing multi-queue-max-queues\n"); | |
408 | ||
4e15ee2c PD |
409 | err = xenbus_printf(XBT_NIL, dev->nodename, |
410 | "feature-ctrl-ring", | |
411 | "%u", true); | |
412 | if (err) | |
413 | pr_debug("Error writing feature-ctrl-ring\n"); | |
414 | ||
31a41898 IC |
415 | script = xenbus_read(XBT_NIL, dev->nodename, "script", NULL); |
416 | if (IS_ERR(script)) { | |
417 | err = PTR_ERR(script); | |
418 | xenbus_dev_fatal(dev, err, "reading script"); | |
419 | goto fail; | |
420 | } | |
421 | ||
422 | be->hotplug_script = script; | |
423 | ||
ea732dff | 424 | |
f942dc25 | 425 | /* This kicks hotplug scripts, so do it immediately. */ |
2dd34339 AK |
426 | err = backend_create_xenvif(be); |
427 | if (err) | |
428 | goto fail; | |
f942dc25 IC |
429 | |
430 | return 0; | |
431 | ||
432 | abort_transaction: | |
433 | xenbus_transaction_end(xbt, 1); | |
434 | xenbus_dev_fatal(dev, err, "%s", message); | |
435 | fail: | |
8ef2c3bc | 436 | pr_debug("failed\n"); |
f942dc25 IC |
437 | netback_remove(dev); |
438 | return err; | |
439 | } | |
440 | ||
441 | ||
442 | /* | |
443 | * Handle the creation of the hotplug script environment. We add the script | |
444 | * and vif variables to the environment, for the benefit of the vif-* hotplug | |
445 | * scripts. | |
446 | */ | |
447 | static int netback_uevent(struct xenbus_device *xdev, | |
448 | struct kobj_uevent_env *env) | |
449 | { | |
450 | struct backend_info *be = dev_get_drvdata(&xdev->dev); | |
f942dc25 | 451 | |
31a41898 IC |
452 | if (!be) |
453 | return 0; | |
454 | ||
455 | if (add_uevent_var(env, "script=%s", be->hotplug_script)) | |
456 | return -ENOMEM; | |
457 | ||
458 | if (!be->vif) | |
f942dc25 IC |
459 | return 0; |
460 | ||
461 | return add_uevent_var(env, "vif=%s", be->vif->dev->name); | |
462 | } | |
463 | ||
464 | ||
2dd34339 | 465 | static int backend_create_xenvif(struct backend_info *be) |
f942dc25 IC |
466 | { |
467 | int err; | |
468 | long handle; | |
469 | struct xenbus_device *dev = be->dev; | |
f15650b7 | 470 | struct xenvif *vif; |
f942dc25 IC |
471 | |
472 | if (be->vif != NULL) | |
2dd34339 | 473 | return 0; |
f942dc25 IC |
474 | |
475 | err = xenbus_scanf(XBT_NIL, dev->nodename, "handle", "%li", &handle); | |
476 | if (err != 1) { | |
477 | xenbus_dev_fatal(dev, err, "reading handle"); | |
2dd34339 | 478 | return (err < 0) ? err : -EINVAL; |
f942dc25 IC |
479 | } |
480 | ||
f15650b7 JB |
481 | vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle); |
482 | if (IS_ERR(vif)) { | |
483 | err = PTR_ERR(vif); | |
f942dc25 | 484 | xenbus_dev_fatal(dev, err, "creating interface"); |
2dd34339 | 485 | return err; |
f942dc25 | 486 | } |
f15650b7 | 487 | be->vif = vif; |
f942dc25 IC |
488 | |
489 | kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE); | |
2dd34339 | 490 | return 0; |
f942dc25 IC |
491 | } |
492 | ||
ea732dff | 493 | static void backend_disconnect(struct backend_info *be) |
f942dc25 | 494 | { |
d67ce7da PD |
495 | struct xenvif *vif = be->vif; |
496 | ||
497 | if (vif) { | |
9a6cdf52 ID |
498 | unsigned int queue_index; |
499 | ||
d67ce7da | 500 | xen_unregister_watchers(vif); |
f51de243 | 501 | #ifdef CONFIG_DEBUG_FS |
d67ce7da | 502 | xenvif_debugfs_delif(vif); |
f51de243 | 503 | #endif /* CONFIG_DEBUG_FS */ |
d67ce7da PD |
504 | xenvif_disconnect_data(vif); |
505 | for (queue_index = 0; | |
506 | queue_index < vif->num_queues; | |
507 | ++queue_index) | |
508 | xenvif_deinit_queue(&vif->queues[queue_index]); | |
509 | ||
510 | spin_lock(&vif->lock); | |
511 | vfree(vif->queues); | |
512 | vif->num_queues = 0; | |
513 | vif->queues = NULL; | |
514 | spin_unlock(&vif->lock); | |
515 | ||
516 | xenvif_disconnect_ctrl(vif); | |
f51de243 | 517 | } |
279f438e PD |
518 | } |
519 | ||
ea732dff | 520 | static void backend_connect(struct backend_info *be) |
279f438e | 521 | { |
ea732dff PD |
522 | if (be->vif) |
523 | connect(be); | |
524 | } | |
279f438e | 525 | |
ea732dff PD |
526 | static inline void backend_switch_state(struct backend_info *be, |
527 | enum xenbus_state state) | |
528 | { | |
529 | struct xenbus_device *dev = be->dev; | |
530 | ||
531 | pr_debug("%s -> %s\n", dev->nodename, xenbus_strstate(state)); | |
532 | be->state = state; | |
533 | ||
534 | /* If we are waiting for a hotplug script then defer the | |
535 | * actual xenbus state change. | |
536 | */ | |
537 | if (!be->have_hotplug_status_watch) | |
538 | xenbus_switch_state(dev, state); | |
539 | } | |
540 | ||
541 | /* Handle backend state transitions: | |
542 | * | |
cce94483 | 543 | * The backend state starts in Initialising and the following transitions are |
ea732dff PD |
544 | * allowed. |
545 | * | |
cce94483 FM |
546 | * Initialising -> InitWait -> Connected |
547 | * \ | |
548 | * \ ^ \ | | |
549 | * \ | \ | | |
550 | * \ | \ | | |
551 | * \ | \ | | |
552 | * \ | \ | | |
553 | * \ | \ | | |
554 | * V | V V | |
ea732dff | 555 | * |
cce94483 | 556 | * Closed <-> Closing |
ea732dff PD |
557 | * |
558 | * The state argument specifies the eventual state of the backend and the | |
559 | * function transitions to that state via the shortest path. | |
560 | */ | |
561 | static void set_backend_state(struct backend_info *be, | |
562 | enum xenbus_state state) | |
563 | { | |
564 | while (be->state != state) { | |
565 | switch (be->state) { | |
cce94483 FM |
566 | case XenbusStateInitialising: |
567 | switch (state) { | |
568 | case XenbusStateInitWait: | |
569 | case XenbusStateConnected: | |
570 | case XenbusStateClosing: | |
571 | backend_switch_state(be, XenbusStateInitWait); | |
572 | break; | |
573 | case XenbusStateClosed: | |
574 | backend_switch_state(be, XenbusStateClosed); | |
575 | break; | |
576 | default: | |
577 | BUG(); | |
578 | } | |
579 | break; | |
ea732dff PD |
580 | case XenbusStateClosed: |
581 | switch (state) { | |
582 | case XenbusStateInitWait: | |
583 | case XenbusStateConnected: | |
ea732dff PD |
584 | backend_switch_state(be, XenbusStateInitWait); |
585 | break; | |
586 | case XenbusStateClosing: | |
587 | backend_switch_state(be, XenbusStateClosing); | |
588 | break; | |
589 | default: | |
590 | BUG(); | |
591 | } | |
592 | break; | |
593 | case XenbusStateInitWait: | |
594 | switch (state) { | |
595 | case XenbusStateConnected: | |
596 | backend_connect(be); | |
597 | backend_switch_state(be, XenbusStateConnected); | |
598 | break; | |
599 | case XenbusStateClosing: | |
600 | case XenbusStateClosed: | |
601 | backend_switch_state(be, XenbusStateClosing); | |
602 | break; | |
603 | default: | |
604 | BUG(); | |
605 | } | |
606 | break; | |
607 | case XenbusStateConnected: | |
608 | switch (state) { | |
609 | case XenbusStateInitWait: | |
610 | case XenbusStateClosing: | |
611 | case XenbusStateClosed: | |
612 | backend_disconnect(be); | |
613 | backend_switch_state(be, XenbusStateClosing); | |
614 | break; | |
615 | default: | |
616 | BUG(); | |
617 | } | |
618 | break; | |
619 | case XenbusStateClosing: | |
620 | switch (state) { | |
621 | case XenbusStateInitWait: | |
622 | case XenbusStateConnected: | |
623 | case XenbusStateClosed: | |
624 | backend_switch_state(be, XenbusStateClosed); | |
625 | break; | |
626 | default: | |
627 | BUG(); | |
628 | } | |
629 | break; | |
630 | default: | |
631 | BUG(); | |
632 | } | |
f942dc25 IC |
633 | } |
634 | } | |
635 | ||
636 | /** | |
637 | * Callback received when the frontend's state changes. | |
638 | */ | |
639 | static void frontend_changed(struct xenbus_device *dev, | |
640 | enum xenbus_state frontend_state) | |
641 | { | |
642 | struct backend_info *be = dev_get_drvdata(&dev->dev); | |
643 | ||
ea732dff | 644 | pr_debug("%s -> %s\n", dev->otherend, xenbus_strstate(frontend_state)); |
f942dc25 IC |
645 | |
646 | be->frontend_state = frontend_state; | |
647 | ||
648 | switch (frontend_state) { | |
649 | case XenbusStateInitialising: | |
ea732dff | 650 | set_backend_state(be, XenbusStateInitWait); |
f942dc25 IC |
651 | break; |
652 | ||
653 | case XenbusStateInitialised: | |
654 | break; | |
655 | ||
656 | case XenbusStateConnected: | |
ea732dff | 657 | set_backend_state(be, XenbusStateConnected); |
f942dc25 IC |
658 | break; |
659 | ||
660 | case XenbusStateClosing: | |
ea732dff | 661 | set_backend_state(be, XenbusStateClosing); |
f942dc25 IC |
662 | break; |
663 | ||
664 | case XenbusStateClosed: | |
ea732dff | 665 | set_backend_state(be, XenbusStateClosed); |
f942dc25 IC |
666 | if (xenbus_dev_is_online(dev)) |
667 | break; | |
668 | /* fall through if not online */ | |
669 | case XenbusStateUnknown: | |
ea732dff | 670 | set_backend_state(be, XenbusStateClosed); |
f942dc25 IC |
671 | device_unregister(&dev->dev); |
672 | break; | |
673 | ||
674 | default: | |
675 | xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend", | |
676 | frontend_state); | |
677 | break; | |
678 | } | |
679 | } | |
680 | ||
681 | ||
682 | static void xen_net_read_rate(struct xenbus_device *dev, | |
683 | unsigned long *bytes, unsigned long *usec) | |
684 | { | |
685 | char *s, *e; | |
686 | unsigned long b, u; | |
687 | char *ratestr; | |
688 | ||
689 | /* Default to unlimited bandwidth. */ | |
690 | *bytes = ~0UL; | |
691 | *usec = 0; | |
692 | ||
693 | ratestr = xenbus_read(XBT_NIL, dev->nodename, "rate", NULL); | |
694 | if (IS_ERR(ratestr)) | |
695 | return; | |
696 | ||
697 | s = ratestr; | |
698 | b = simple_strtoul(s, &e, 10); | |
699 | if ((s == e) || (*e != ',')) | |
700 | goto fail; | |
701 | ||
702 | s = e + 1; | |
703 | u = simple_strtoul(s, &e, 10); | |
704 | if ((s == e) || (*e != '\0')) | |
705 | goto fail; | |
706 | ||
707 | *bytes = b; | |
708 | *usec = u; | |
709 | ||
710 | kfree(ratestr); | |
711 | return; | |
712 | ||
713 | fail: | |
714 | pr_warn("Failed to parse network rate limit. Traffic unlimited.\n"); | |
715 | kfree(ratestr); | |
716 | } | |
717 | ||
718 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | |
719 | { | |
720 | char *s, *e, *macstr; | |
721 | int i; | |
722 | ||
723 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | |
724 | if (IS_ERR(macstr)) | |
725 | return PTR_ERR(macstr); | |
726 | ||
727 | for (i = 0; i < ETH_ALEN; i++) { | |
728 | mac[i] = simple_strtoul(s, &e, 16); | |
729 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | |
730 | kfree(macstr); | |
731 | return -ENOENT; | |
732 | } | |
733 | s = e+1; | |
734 | } | |
735 | ||
736 | kfree(macstr); | |
737 | return 0; | |
738 | } | |
739 | ||
edafc132 | 740 | static void xen_net_rate_changed(struct xenbus_watch *watch, |
5584ea25 | 741 | const char *path, const char *token) |
edafc132 PI |
742 | { |
743 | struct xenvif *vif = container_of(watch, struct xenvif, credit_watch); | |
744 | struct xenbus_device *dev = xenvif_to_xenbus_device(vif); | |
745 | unsigned long credit_bytes; | |
746 | unsigned long credit_usec; | |
747 | unsigned int queue_index; | |
748 | ||
749 | xen_net_read_rate(dev, &credit_bytes, &credit_usec); | |
750 | for (queue_index = 0; queue_index < vif->num_queues; queue_index++) { | |
751 | struct xenvif_queue *queue = &vif->queues[queue_index]; | |
752 | ||
753 | queue->credit_bytes = credit_bytes; | |
754 | queue->credit_usec = credit_usec; | |
755 | if (!mod_timer_pending(&queue->credit_timeout, jiffies) && | |
756 | queue->remaining_credit > queue->credit_bytes) { | |
757 | queue->remaining_credit = queue->credit_bytes; | |
758 | } | |
759 | } | |
760 | } | |
761 | ||
22fae97d PD |
762 | static int xen_register_credit_watch(struct xenbus_device *dev, |
763 | struct xenvif *vif) | |
edafc132 PI |
764 | { |
765 | int err = 0; | |
766 | char *node; | |
767 | unsigned maxlen = strlen(dev->nodename) + sizeof("/rate"); | |
768 | ||
12b322ac PI |
769 | if (vif->credit_watch.node) |
770 | return -EADDRINUSE; | |
771 | ||
edafc132 PI |
772 | node = kmalloc(maxlen, GFP_KERNEL); |
773 | if (!node) | |
774 | return -ENOMEM; | |
775 | snprintf(node, maxlen, "%s/rate", dev->nodename); | |
776 | vif->credit_watch.node = node; | |
777 | vif->credit_watch.callback = xen_net_rate_changed; | |
778 | err = register_xenbus_watch(&vif->credit_watch); | |
779 | if (err) { | |
780 | pr_err("Failed to set watcher %s\n", vif->credit_watch.node); | |
781 | kfree(node); | |
782 | vif->credit_watch.node = NULL; | |
783 | vif->credit_watch.callback = NULL; | |
784 | } | |
785 | return err; | |
786 | } | |
787 | ||
22fae97d | 788 | static void xen_unregister_credit_watch(struct xenvif *vif) |
edafc132 PI |
789 | { |
790 | if (vif->credit_watch.node) { | |
791 | unregister_xenbus_watch(&vif->credit_watch); | |
792 | kfree(vif->credit_watch.node); | |
793 | vif->credit_watch.node = NULL; | |
794 | } | |
795 | } | |
796 | ||
22fae97d | 797 | static void xen_mcast_ctrl_changed(struct xenbus_watch *watch, |
5584ea25 | 798 | const char *path, const char *token) |
22fae97d PD |
799 | { |
800 | struct xenvif *vif = container_of(watch, struct xenvif, | |
801 | mcast_ctrl_watch); | |
802 | struct xenbus_device *dev = xenvif_to_xenbus_device(vif); | |
22fae97d | 803 | |
f95842e7 JG |
804 | vif->multicast_control = !!xenbus_read_unsigned(dev->otherend, |
805 | "request-multicast-control", 0); | |
22fae97d PD |
806 | } |
807 | ||
808 | static int xen_register_mcast_ctrl_watch(struct xenbus_device *dev, | |
809 | struct xenvif *vif) | |
810 | { | |
811 | int err = 0; | |
812 | char *node; | |
813 | unsigned maxlen = strlen(dev->otherend) + | |
814 | sizeof("/request-multicast-control"); | |
815 | ||
816 | if (vif->mcast_ctrl_watch.node) { | |
817 | pr_err_ratelimited("Watch is already registered\n"); | |
818 | return -EADDRINUSE; | |
819 | } | |
820 | ||
821 | node = kmalloc(maxlen, GFP_KERNEL); | |
822 | if (!node) { | |
823 | pr_err("Failed to allocate memory for watch\n"); | |
824 | return -ENOMEM; | |
825 | } | |
826 | snprintf(node, maxlen, "%s/request-multicast-control", | |
827 | dev->otherend); | |
828 | vif->mcast_ctrl_watch.node = node; | |
829 | vif->mcast_ctrl_watch.callback = xen_mcast_ctrl_changed; | |
830 | err = register_xenbus_watch(&vif->mcast_ctrl_watch); | |
831 | if (err) { | |
832 | pr_err("Failed to set watcher %s\n", | |
833 | vif->mcast_ctrl_watch.node); | |
834 | kfree(node); | |
835 | vif->mcast_ctrl_watch.node = NULL; | |
836 | vif->mcast_ctrl_watch.callback = NULL; | |
837 | } | |
838 | return err; | |
839 | } | |
840 | ||
841 | static void xen_unregister_mcast_ctrl_watch(struct xenvif *vif) | |
842 | { | |
843 | if (vif->mcast_ctrl_watch.node) { | |
844 | unregister_xenbus_watch(&vif->mcast_ctrl_watch); | |
845 | kfree(vif->mcast_ctrl_watch.node); | |
846 | vif->mcast_ctrl_watch.node = NULL; | |
847 | } | |
848 | } | |
849 | ||
850 | static void xen_register_watchers(struct xenbus_device *dev, | |
851 | struct xenvif *vif) | |
852 | { | |
853 | xen_register_credit_watch(dev, vif); | |
854 | xen_register_mcast_ctrl_watch(dev, vif); | |
855 | } | |
856 | ||
857 | static void xen_unregister_watchers(struct xenvif *vif) | |
858 | { | |
859 | xen_unregister_mcast_ctrl_watch(vif); | |
860 | xen_unregister_credit_watch(vif); | |
861 | } | |
862 | ||
f942dc25 IC |
863 | static void unregister_hotplug_status_watch(struct backend_info *be) |
864 | { | |
865 | if (be->have_hotplug_status_watch) { | |
866 | unregister_xenbus_watch(&be->hotplug_status_watch); | |
867 | kfree(be->hotplug_status_watch.node); | |
868 | } | |
869 | be->have_hotplug_status_watch = 0; | |
870 | } | |
871 | ||
872 | static void hotplug_status_changed(struct xenbus_watch *watch, | |
5584ea25 JG |
873 | const char *path, |
874 | const char *token) | |
f942dc25 IC |
875 | { |
876 | struct backend_info *be = container_of(watch, | |
877 | struct backend_info, | |
878 | hotplug_status_watch); | |
879 | char *str; | |
880 | unsigned int len; | |
881 | ||
882 | str = xenbus_read(XBT_NIL, be->dev->nodename, "hotplug-status", &len); | |
883 | if (IS_ERR(str)) | |
884 | return; | |
885 | if (len == sizeof("connected")-1 && !memcmp(str, "connected", len)) { | |
ea732dff PD |
886 | /* Complete any pending state change */ |
887 | xenbus_switch_state(be->dev, be->state); | |
888 | ||
f942dc25 IC |
889 | /* Not interested in this watch anymore. */ |
890 | unregister_hotplug_status_watch(be); | |
891 | } | |
892 | kfree(str); | |
893 | } | |
894 | ||
4e15ee2c PD |
895 | static int connect_ctrl_ring(struct backend_info *be) |
896 | { | |
897 | struct xenbus_device *dev = be->dev; | |
898 | struct xenvif *vif = be->vif; | |
899 | unsigned int val; | |
900 | grant_ref_t ring_ref; | |
901 | unsigned int evtchn; | |
902 | int err; | |
903 | ||
6c27f99d JB |
904 | err = xenbus_scanf(XBT_NIL, dev->otherend, |
905 | "ctrl-ring-ref", "%u", &val); | |
906 | if (err < 0) | |
4e15ee2c PD |
907 | goto done; /* The frontend does not have a control ring */ |
908 | ||
909 | ring_ref = val; | |
910 | ||
6c27f99d JB |
911 | err = xenbus_scanf(XBT_NIL, dev->otherend, |
912 | "event-channel-ctrl", "%u", &val); | |
913 | if (err < 0) { | |
4e15ee2c PD |
914 | xenbus_dev_fatal(dev, err, |
915 | "reading %s/event-channel-ctrl", | |
916 | dev->otherend); | |
917 | goto fail; | |
918 | } | |
919 | ||
920 | evtchn = val; | |
921 | ||
922 | err = xenvif_connect_ctrl(vif, ring_ref, evtchn); | |
923 | if (err) { | |
924 | xenbus_dev_fatal(dev, err, | |
925 | "mapping shared-frame %u port %u", | |
926 | ring_ref, evtchn); | |
927 | goto fail; | |
928 | } | |
929 | ||
930 | done: | |
931 | return 0; | |
932 | ||
933 | fail: | |
934 | return err; | |
935 | } | |
936 | ||
f942dc25 IC |
937 | static void connect(struct backend_info *be) |
938 | { | |
939 | int err; | |
940 | struct xenbus_device *dev = be->dev; | |
e9ce7cb6 WL |
941 | unsigned long credit_bytes, credit_usec; |
942 | unsigned int queue_index; | |
8d3d53b3 | 943 | unsigned int requested_num_queues; |
e9ce7cb6 | 944 | struct xenvif_queue *queue; |
f942dc25 | 945 | |
8d3d53b3 AB |
946 | /* Check whether the frontend requested multiple queues |
947 | * and read the number requested. | |
948 | */ | |
f95842e7 JG |
949 | requested_num_queues = xenbus_read_unsigned(dev->otherend, |
950 | "multi-queue-num-queues", 1); | |
951 | if (requested_num_queues > xenvif_max_queues) { | |
8d3d53b3 | 952 | /* buggy or malicious guest */ |
0f06ac3b | 953 | xenbus_dev_fatal(dev, -EINVAL, |
8d3d53b3 AB |
954 | "guest requested %u queues, exceeding the maximum of %u.", |
955 | requested_num_queues, xenvif_max_queues); | |
956 | return; | |
957 | } | |
958 | ||
f942dc25 IC |
959 | err = xen_net_read_mac(dev, be->vif->fe_dev_addr); |
960 | if (err) { | |
961 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | |
962 | return; | |
963 | } | |
964 | ||
e9ce7cb6 | 965 | xen_net_read_rate(dev, &credit_bytes, &credit_usec); |
12b322ac | 966 | xen_unregister_watchers(be->vif); |
edafc132 | 967 | xen_register_watchers(dev, be->vif); |
e9ce7cb6 WL |
968 | read_xenbus_vif_flags(be); |
969 | ||
4e15ee2c PD |
970 | err = connect_ctrl_ring(be); |
971 | if (err) { | |
972 | xenbus_dev_fatal(dev, err, "connecting control ring"); | |
973 | return; | |
974 | } | |
975 | ||
8d3d53b3 | 976 | /* Use the number of queues requested by the frontend */ |
e9ce7cb6 WL |
977 | be->vif->queues = vzalloc(requested_num_queues * |
978 | sizeof(struct xenvif_queue)); | |
833b8f18 IY |
979 | if (!be->vif->queues) { |
980 | xenbus_dev_fatal(dev, -ENOMEM, | |
981 | "allocating queues"); | |
982 | return; | |
983 | } | |
984 | ||
f7b50c4e | 985 | be->vif->num_queues = requested_num_queues; |
ecf08d2d | 986 | be->vif->stalled_queues = requested_num_queues; |
e9ce7cb6 WL |
987 | |
988 | for (queue_index = 0; queue_index < requested_num_queues; ++queue_index) { | |
989 | queue = &be->vif->queues[queue_index]; | |
990 | queue->vif = be->vif; | |
991 | queue->id = queue_index; | |
992 | snprintf(queue->name, sizeof(queue->name), "%s-q%u", | |
993 | be->vif->dev->name, queue->id); | |
994 | ||
995 | err = xenvif_init_queue(queue); | |
8d3d53b3 AB |
996 | if (err) { |
997 | /* xenvif_init_queue() cleans up after itself on | |
998 | * failure, but we need to clean up any previously | |
999 | * initialised queues. Set num_queues to i so that | |
1000 | * earlier queues can be destroyed using the regular | |
1001 | * disconnect logic. | |
1002 | */ | |
f7b50c4e | 1003 | be->vif->num_queues = queue_index; |
e9ce7cb6 | 1004 | goto err; |
8d3d53b3 | 1005 | } |
e9ce7cb6 | 1006 | |
ce0e5c52 | 1007 | queue->credit_bytes = credit_bytes; |
e9ce7cb6 | 1008 | queue->remaining_credit = credit_bytes; |
07ff890d | 1009 | queue->credit_usec = credit_usec; |
e9ce7cb6 | 1010 | |
4e15ee2c | 1011 | err = connect_data_rings(be, queue); |
8d3d53b3 | 1012 | if (err) { |
4e15ee2c PD |
1013 | /* connect_data_rings() cleans up after itself on |
1014 | * failure, but we need to clean up after | |
1015 | * xenvif_init_queue() here, and also clean up any | |
1016 | * previously initialised queues. | |
8d3d53b3 AB |
1017 | */ |
1018 | xenvif_deinit_queue(queue); | |
f7b50c4e | 1019 | be->vif->num_queues = queue_index; |
e9ce7cb6 | 1020 | goto err; |
8d3d53b3 | 1021 | } |
628fa76b WL |
1022 | } |
1023 | ||
f51de243 | 1024 | #ifdef CONFIG_DEBUG_FS |
628fa76b | 1025 | xenvif_debugfs_addif(be->vif); |
f51de243 | 1026 | #endif /* CONFIG_DEBUG_FS */ |
e9ce7cb6 | 1027 | |
f7b50c4e WL |
1028 | /* Initialisation completed, tell core driver the number of |
1029 | * active queues. | |
1030 | */ | |
1031 | rtnl_lock(); | |
1032 | netif_set_real_num_tx_queues(be->vif->dev, requested_num_queues); | |
1033 | netif_set_real_num_rx_queues(be->vif->dev, requested_num_queues); | |
1034 | rtnl_unlock(); | |
1035 | ||
e9ce7cb6 | 1036 | xenvif_carrier_on(be->vif); |
f942dc25 IC |
1037 | |
1038 | unregister_hotplug_status_watch(be); | |
1039 | err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch, | |
1040 | hotplug_status_changed, | |
1041 | "%s/%s", dev->nodename, "hotplug-status"); | |
ea732dff | 1042 | if (!err) |
f942dc25 | 1043 | be->have_hotplug_status_watch = 1; |
f942dc25 | 1044 | |
e9ce7cb6 WL |
1045 | netif_tx_wake_all_queues(be->vif->dev); |
1046 | ||
1047 | return; | |
1048 | ||
1049 | err: | |
f7b50c4e | 1050 | if (be->vif->num_queues > 0) |
4e15ee2c | 1051 | xenvif_disconnect_data(be->vif); /* Clean up existing queues */ |
9a6cdf52 ID |
1052 | for (queue_index = 0; queue_index < be->vif->num_queues; ++queue_index) |
1053 | xenvif_deinit_queue(&be->vif->queues[queue_index]); | |
e9ce7cb6 WL |
1054 | vfree(be->vif->queues); |
1055 | be->vif->queues = NULL; | |
f7b50c4e | 1056 | be->vif->num_queues = 0; |
4e15ee2c | 1057 | xenvif_disconnect_ctrl(be->vif); |
e9ce7cb6 | 1058 | return; |
f942dc25 IC |
1059 | } |
1060 | ||
1061 | ||
4e15ee2c PD |
1062 | static int connect_data_rings(struct backend_info *be, |
1063 | struct xenvif_queue *queue) | |
f942dc25 | 1064 | { |
f942dc25 | 1065 | struct xenbus_device *dev = be->dev; |
f7b50c4e | 1066 | unsigned int num_queues = queue->vif->num_queues; |
f942dc25 | 1067 | unsigned long tx_ring_ref, rx_ring_ref; |
e9ce7cb6 | 1068 | unsigned int tx_evtchn, rx_evtchn; |
f942dc25 | 1069 | int err; |
8d3d53b3 AB |
1070 | char *xspath; |
1071 | size_t xspathsize; | |
1072 | const size_t xenstore_path_ext_size = 11; /* sufficient for "/queue-NNN" */ | |
1073 | ||
1074 | /* If the frontend requested 1 queue, or we have fallen back | |
1075 | * to single queue due to lack of frontend support for multi- | |
1076 | * queue, expect the remaining XenStore keys in the toplevel | |
1077 | * directory. Otherwise, expect them in a subdirectory called | |
1078 | * queue-N. | |
1079 | */ | |
1080 | if (num_queues == 1) { | |
1081 | xspath = kzalloc(strlen(dev->otherend) + 1, GFP_KERNEL); | |
1082 | if (!xspath) { | |
1083 | xenbus_dev_fatal(dev, -ENOMEM, | |
1084 | "reading ring references"); | |
1085 | return -ENOMEM; | |
1086 | } | |
1087 | strcpy(xspath, dev->otherend); | |
1088 | } else { | |
1089 | xspathsize = strlen(dev->otherend) + xenstore_path_ext_size; | |
1090 | xspath = kzalloc(xspathsize, GFP_KERNEL); | |
1091 | if (!xspath) { | |
1092 | xenbus_dev_fatal(dev, -ENOMEM, | |
1093 | "reading ring references"); | |
1094 | return -ENOMEM; | |
1095 | } | |
1096 | snprintf(xspath, xspathsize, "%s/queue-%u", dev->otherend, | |
1097 | queue->id); | |
1098 | } | |
f942dc25 | 1099 | |
8d3d53b3 | 1100 | err = xenbus_gather(XBT_NIL, xspath, |
f942dc25 | 1101 | "tx-ring-ref", "%lu", &tx_ring_ref, |
e1f00a69 | 1102 | "rx-ring-ref", "%lu", &rx_ring_ref, NULL); |
f942dc25 IC |
1103 | if (err) { |
1104 | xenbus_dev_fatal(dev, err, | |
e1f00a69 | 1105 | "reading %s/ring-ref", |
8d3d53b3 AB |
1106 | xspath); |
1107 | goto err; | |
f942dc25 IC |
1108 | } |
1109 | ||
e1f00a69 | 1110 | /* Try split event channels first, then single event channel. */ |
8d3d53b3 | 1111 | err = xenbus_gather(XBT_NIL, xspath, |
e1f00a69 WL |
1112 | "event-channel-tx", "%u", &tx_evtchn, |
1113 | "event-channel-rx", "%u", &rx_evtchn, NULL); | |
1114 | if (err < 0) { | |
8d3d53b3 | 1115 | err = xenbus_scanf(XBT_NIL, xspath, |
e1f00a69 WL |
1116 | "event-channel", "%u", &tx_evtchn); |
1117 | if (err < 0) { | |
1118 | xenbus_dev_fatal(dev, err, | |
1119 | "reading %s/event-channel(-tx/rx)", | |
8d3d53b3 AB |
1120 | xspath); |
1121 | goto err; | |
e1f00a69 WL |
1122 | } |
1123 | rx_evtchn = tx_evtchn; | |
1124 | } | |
1125 | ||
e9ce7cb6 | 1126 | /* Map the shared frame, irq etc. */ |
4e15ee2c PD |
1127 | err = xenvif_connect_data(queue, tx_ring_ref, rx_ring_ref, |
1128 | tx_evtchn, rx_evtchn); | |
e9ce7cb6 WL |
1129 | if (err) { |
1130 | xenbus_dev_fatal(dev, err, | |
1131 | "mapping shared-frames %lu/%lu port tx %u rx %u", | |
1132 | tx_ring_ref, rx_ring_ref, | |
1133 | tx_evtchn, rx_evtchn); | |
8d3d53b3 | 1134 | goto err; |
e9ce7cb6 WL |
1135 | } |
1136 | ||
8d3d53b3 AB |
1137 | err = 0; |
1138 | err: /* Regular return falls through with err == 0 */ | |
1139 | kfree(xspath); | |
1140 | return err; | |
e9ce7cb6 WL |
1141 | } |
1142 | ||
1143 | static int read_xenbus_vif_flags(struct backend_info *be) | |
1144 | { | |
1145 | struct xenvif *vif = be->vif; | |
1146 | struct xenbus_device *dev = be->dev; | |
1147 | unsigned int rx_copy; | |
f95842e7 | 1148 | int err; |
e9ce7cb6 | 1149 | |
f942dc25 IC |
1150 | err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u", |
1151 | &rx_copy); | |
1152 | if (err == -ENOENT) { | |
1153 | err = 0; | |
1154 | rx_copy = 0; | |
1155 | } | |
1156 | if (err < 0) { | |
1157 | xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy", | |
1158 | dev->otherend); | |
1159 | return err; | |
1160 | } | |
1161 | if (!rx_copy) | |
1162 | return -EOPNOTSUPP; | |
1163 | ||
f95842e7 | 1164 | if (!xenbus_read_unsigned(dev->otherend, "feature-rx-notify", 0)) { |
26c0e102 DV |
1165 | /* - Reduce drain timeout to poll more frequently for |
1166 | * Rx requests. | |
1167 | * - Disable Rx stall detection. | |
1168 | */ | |
1169 | be->vif->drain_timeout = msecs_to_jiffies(30); | |
1170 | be->vif->stall_timeout = 0; | |
f942dc25 IC |
1171 | } |
1172 | ||
f95842e7 | 1173 | vif->can_sg = !!xenbus_read_unsigned(dev->otherend, "feature-sg", 0); |
f942dc25 | 1174 | |
82cada22 | 1175 | vif->gso_mask = 0; |
82cada22 | 1176 | |
f95842e7 | 1177 | if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv4", 0)) |
82cada22 | 1178 | vif->gso_mask |= GSO_BIT(TCPV4); |
f942dc25 | 1179 | |
f95842e7 | 1180 | if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv6", 0)) |
82cada22 PD |
1181 | vif->gso_mask |= GSO_BIT(TCPV6); |
1182 | ||
f95842e7 JG |
1183 | vif->ip_csum = !xenbus_read_unsigned(dev->otherend, |
1184 | "feature-no-csum-offload", 0); | |
146c8a77 | 1185 | |
f95842e7 JG |
1186 | vif->ipv6_csum = !!xenbus_read_unsigned(dev->otherend, |
1187 | "feature-ipv6-csum-offload", 0); | |
f942dc25 | 1188 | |
f942dc25 IC |
1189 | return 0; |
1190 | } | |
1191 | ||
f942dc25 IC |
1192 | static const struct xenbus_device_id netback_ids[] = { |
1193 | { "vif" }, | |
1194 | { "" } | |
1195 | }; | |
1196 | ||
95afae48 DV |
1197 | static struct xenbus_driver netback_driver = { |
1198 | .ids = netback_ids, | |
f942dc25 IC |
1199 | .probe = netback_probe, |
1200 | .remove = netback_remove, | |
1201 | .uevent = netback_uevent, | |
1202 | .otherend_changed = frontend_changed, | |
95afae48 | 1203 | }; |
f942dc25 IC |
1204 | |
1205 | int xenvif_xenbus_init(void) | |
1206 | { | |
73db144b | 1207 | return xenbus_register_backend(&netback_driver); |
f942dc25 | 1208 | } |
b103f358 WL |
1209 | |
1210 | void xenvif_xenbus_fini(void) | |
1211 | { | |
1212 | return xenbus_unregister_driver(&netback_driver); | |
1213 | } |