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 | 24 | |
4e15ee2c PD |
25 | static int connect_data_rings(struct backend_info *be, |
26 | struct xenvif_queue *queue); | |
e9ce7cb6 WL |
27 | static void connect(struct backend_info *be); |
28 | static int read_xenbus_vif_flags(struct backend_info *be); | |
2dd34339 | 29 | static int backend_create_xenvif(struct backend_info *be); |
f942dc25 | 30 | static void unregister_hotplug_status_watch(struct backend_info *be); |
edafc132 | 31 | static void xen_unregister_watchers(struct xenvif *vif); |
dc62ccac DV |
32 | static void set_backend_state(struct backend_info *be, |
33 | enum xenbus_state state); | |
f942dc25 | 34 | |
f51de243 ZK |
35 | #ifdef CONFIG_DEBUG_FS |
36 | struct dentry *xen_netback_dbg_root = NULL; | |
37 | ||
38 | static int xenvif_read_io_ring(struct seq_file *m, void *v) | |
39 | { | |
40 | struct xenvif_queue *queue = m->private; | |
41 | struct xen_netif_tx_back_ring *tx_ring = &queue->tx; | |
42 | struct xen_netif_rx_back_ring *rx_ring = &queue->rx; | |
f48da8b1 | 43 | struct netdev_queue *dev_queue; |
f51de243 ZK |
44 | |
45 | if (tx_ring->sring) { | |
46 | struct xen_netif_tx_sring *sring = tx_ring->sring; | |
47 | ||
48 | seq_printf(m, "Queue %d\nTX: nr_ents %u\n", queue->id, | |
49 | tx_ring->nr_ents); | |
50 | seq_printf(m, "req prod %u (%d) cons %u (%d) event %u (%d)\n", | |
51 | sring->req_prod, | |
52 | sring->req_prod - sring->rsp_prod, | |
53 | tx_ring->req_cons, | |
54 | tx_ring->req_cons - sring->rsp_prod, | |
55 | sring->req_event, | |
56 | sring->req_event - sring->rsp_prod); | |
57 | seq_printf(m, "rsp prod %u (base) pvt %u (%d) event %u (%d)\n", | |
58 | sring->rsp_prod, | |
59 | tx_ring->rsp_prod_pvt, | |
60 | tx_ring->rsp_prod_pvt - sring->rsp_prod, | |
61 | sring->rsp_event, | |
62 | sring->rsp_event - sring->rsp_prod); | |
63 | seq_printf(m, "pending prod %u pending cons %u nr_pending_reqs %u\n", | |
64 | queue->pending_prod, | |
65 | queue->pending_cons, | |
66 | nr_pending_reqs(queue)); | |
67 | seq_printf(m, "dealloc prod %u dealloc cons %u dealloc_queue %u\n\n", | |
68 | queue->dealloc_prod, | |
69 | queue->dealloc_cons, | |
70 | queue->dealloc_prod - queue->dealloc_cons); | |
71 | } | |
72 | ||
73 | if (rx_ring->sring) { | |
74 | struct xen_netif_rx_sring *sring = rx_ring->sring; | |
75 | ||
76 | seq_printf(m, "RX: nr_ents %u\n", rx_ring->nr_ents); | |
77 | seq_printf(m, "req prod %u (%d) cons %u (%d) event %u (%d)\n", | |
78 | sring->req_prod, | |
79 | sring->req_prod - sring->rsp_prod, | |
80 | rx_ring->req_cons, | |
81 | rx_ring->req_cons - sring->rsp_prod, | |
82 | sring->req_event, | |
83 | sring->req_event - sring->rsp_prod); | |
84 | seq_printf(m, "rsp prod %u (base) pvt %u (%d) event %u (%d)\n\n", | |
85 | sring->rsp_prod, | |
86 | rx_ring->rsp_prod_pvt, | |
87 | rx_ring->rsp_prod_pvt - sring->rsp_prod, | |
88 | sring->rsp_event, | |
89 | sring->rsp_event - sring->rsp_prod); | |
90 | } | |
91 | ||
92 | seq_printf(m, "NAPI state: %lx NAPI weight: %d TX queue len %u\n" | |
93 | "Credit timer_pending: %d, credit: %lu, usec: %lu\n" | |
94 | "remaining: %lu, expires: %lu, now: %lu\n", | |
95 | queue->napi.state, queue->napi.weight, | |
96 | skb_queue_len(&queue->tx_queue), | |
97 | timer_pending(&queue->credit_timeout), | |
98 | queue->credit_bytes, | |
99 | queue->credit_usec, | |
100 | queue->remaining_credit, | |
101 | queue->credit_timeout.expires, | |
102 | jiffies); | |
103 | ||
f48da8b1 DV |
104 | dev_queue = netdev_get_tx_queue(queue->vif->dev, queue->id); |
105 | ||
106 | seq_printf(m, "\nRx internal queue: len %u max %u pkts %u %s\n", | |
107 | queue->rx_queue_len, queue->rx_queue_max, | |
108 | skb_queue_len(&queue->rx_queue), | |
109 | netif_tx_queue_stopped(dev_queue) ? "stopped" : "running"); | |
110 | ||
f51de243 ZK |
111 | return 0; |
112 | } | |
113 | ||
114 | #define XENVIF_KICK_STR "kick" | |
5c807005 | 115 | #define BUFFER_SIZE 32 |
f51de243 ZK |
116 | |
117 | static ssize_t | |
118 | xenvif_write_io_ring(struct file *filp, const char __user *buf, size_t count, | |
119 | loff_t *ppos) | |
120 | { | |
121 | struct xenvif_queue *queue = | |
122 | ((struct seq_file *)filp->private_data)->private; | |
123 | int len; | |
5c807005 | 124 | char write[BUFFER_SIZE]; |
f51de243 ZK |
125 | |
126 | /* don't allow partial writes and check the length */ | |
127 | if (*ppos != 0) | |
128 | return 0; | |
5c807005 | 129 | if (count >= sizeof(write)) |
f51de243 ZK |
130 | return -ENOSPC; |
131 | ||
132 | len = simple_write_to_buffer(write, | |
5c807005 | 133 | sizeof(write) - 1, |
f51de243 ZK |
134 | ppos, |
135 | buf, | |
136 | count); | |
137 | if (len < 0) | |
138 | return len; | |
139 | ||
5c807005 WL |
140 | write[len] = '\0'; |
141 | ||
f51de243 ZK |
142 | if (!strncmp(write, XENVIF_KICK_STR, sizeof(XENVIF_KICK_STR) - 1)) |
143 | xenvif_interrupt(0, (void *)queue); | |
144 | else { | |
145 | pr_warn("Unknown command to io_ring_q%d. Available: kick\n", | |
146 | queue->id); | |
147 | count = -EINVAL; | |
148 | } | |
149 | return count; | |
150 | } | |
151 | ||
a9339b8e | 152 | static int xenvif_io_ring_open(struct inode *inode, struct file *filp) |
f51de243 ZK |
153 | { |
154 | int ret; | |
155 | void *queue = NULL; | |
156 | ||
157 | if (inode->i_private) | |
158 | queue = inode->i_private; | |
159 | ret = single_open(filp, xenvif_read_io_ring, queue); | |
160 | filp->f_mode |= FMODE_PWRITE; | |
161 | return ret; | |
162 | } | |
163 | ||
164 | static const struct file_operations xenvif_dbg_io_ring_ops_fops = { | |
165 | .owner = THIS_MODULE, | |
a9339b8e | 166 | .open = xenvif_io_ring_open, |
f51de243 ZK |
167 | .read = seq_read, |
168 | .llseek = seq_lseek, | |
169 | .release = single_release, | |
170 | .write = xenvif_write_io_ring, | |
171 | }; | |
172 | ||
5061e3f4 | 173 | static int xenvif_ctrl_show(struct seq_file *m, void *v) |
a9339b8e PD |
174 | { |
175 | struct xenvif *vif = m->private; | |
176 | ||
177 | xenvif_dump_hash_info(vif, m); | |
178 | ||
179 | return 0; | |
180 | } | |
5061e3f4 | 181 | DEFINE_SHOW_ATTRIBUTE(xenvif_ctrl); |
a9339b8e | 182 | |
628fa76b | 183 | static void xenvif_debugfs_addif(struct xenvif *vif) |
f51de243 ZK |
184 | { |
185 | struct dentry *pfile; | |
f51de243 ZK |
186 | int i; |
187 | ||
188 | if (IS_ERR_OR_NULL(xen_netback_dbg_root)) | |
189 | return; | |
190 | ||
191 | vif->xenvif_dbg_root = debugfs_create_dir(vif->dev->name, | |
192 | xen_netback_dbg_root); | |
193 | if (!IS_ERR_OR_NULL(vif->xenvif_dbg_root)) { | |
194 | for (i = 0; i < vif->num_queues; ++i) { | |
195 | char filename[sizeof("io_ring_q") + 4]; | |
196 | ||
197 | snprintf(filename, sizeof(filename), "io_ring_q%d", i); | |
198 | pfile = debugfs_create_file(filename, | |
d61e4038 | 199 | 0600, |
f51de243 ZK |
200 | vif->xenvif_dbg_root, |
201 | &vif->queues[i], | |
202 | &xenvif_dbg_io_ring_ops_fops); | |
203 | if (IS_ERR_OR_NULL(pfile)) | |
204 | pr_warn("Creation of io_ring file returned %ld!\n", | |
205 | PTR_ERR(pfile)); | |
206 | } | |
a9339b8e PD |
207 | |
208 | if (vif->ctrl_irq) { | |
209 | pfile = debugfs_create_file("ctrl", | |
d61e4038 | 210 | 0400, |
a9339b8e PD |
211 | vif->xenvif_dbg_root, |
212 | vif, | |
5061e3f4 | 213 | &xenvif_ctrl_fops); |
a9339b8e PD |
214 | if (IS_ERR_OR_NULL(pfile)) |
215 | pr_warn("Creation of ctrl file returned %ld!\n", | |
216 | PTR_ERR(pfile)); | |
217 | } | |
f51de243 ZK |
218 | } else |
219 | netdev_warn(vif->dev, | |
220 | "Creation of vif debugfs dir returned %ld!\n", | |
221 | PTR_ERR(vif->xenvif_dbg_root)); | |
222 | } | |
223 | ||
224 | static void xenvif_debugfs_delif(struct xenvif *vif) | |
225 | { | |
226 | if (IS_ERR_OR_NULL(xen_netback_dbg_root)) | |
227 | return; | |
228 | ||
0527097c | 229 | debugfs_remove_recursive(vif->xenvif_dbg_root); |
f51de243 ZK |
230 | vif->xenvif_dbg_root = NULL; |
231 | } | |
232 | #endif /* CONFIG_DEBUG_FS */ | |
233 | ||
f942dc25 IC |
234 | static int netback_remove(struct xenbus_device *dev) |
235 | { | |
236 | struct backend_info *be = dev_get_drvdata(&dev->dev); | |
237 | ||
dc62ccac DV |
238 | set_backend_state(be, XenbusStateClosed); |
239 | ||
f942dc25 IC |
240 | unregister_hotplug_status_watch(be); |
241 | if (be->vif) { | |
242 | kobject_uevent(&dev->dev.kobj, KOBJ_OFFLINE); | |
edafc132 | 243 | xen_unregister_watchers(be->vif); |
f942dc25 | 244 | xenbus_rm(XBT_NIL, dev->nodename, "hotplug-status"); |
279f438e | 245 | xenvif_free(be->vif); |
f942dc25 IC |
246 | be->vif = NULL; |
247 | } | |
31a41898 | 248 | kfree(be->hotplug_script); |
f942dc25 IC |
249 | kfree(be); |
250 | dev_set_drvdata(&dev->dev, NULL); | |
251 | return 0; | |
252 | } | |
253 | ||
254 | ||
255 | /** | |
256 | * Entry point to this code when a new device is created. Allocate the basic | |
257 | * structures and switch to InitWait. | |
258 | */ | |
259 | static int netback_probe(struct xenbus_device *dev, | |
260 | const struct xenbus_device_id *id) | |
261 | { | |
262 | const char *message; | |
263 | struct xenbus_transaction xbt; | |
264 | int err; | |
265 | int sg; | |
31a41898 | 266 | const char *script; |
f942dc25 IC |
267 | struct backend_info *be = kzalloc(sizeof(struct backend_info), |
268 | GFP_KERNEL); | |
269 | if (!be) { | |
270 | xenbus_dev_fatal(dev, -ENOMEM, | |
271 | "allocating backend structure"); | |
272 | return -ENOMEM; | |
273 | } | |
274 | ||
275 | be->dev = dev; | |
276 | dev_set_drvdata(&dev->dev, be); | |
277 | ||
cce94483 FM |
278 | be->state = XenbusStateInitialising; |
279 | err = xenbus_switch_state(dev, XenbusStateInitialising); | |
280 | if (err) | |
281 | goto fail; | |
282 | ||
f942dc25 IC |
283 | sg = 1; |
284 | ||
285 | do { | |
286 | err = xenbus_transaction_start(&xbt); | |
287 | if (err) { | |
288 | xenbus_dev_fatal(dev, err, "starting transaction"); | |
289 | goto fail; | |
290 | } | |
291 | ||
292 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", sg); | |
293 | if (err) { | |
294 | message = "writing feature-sg"; | |
295 | goto abort_transaction; | |
296 | } | |
297 | ||
298 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", | |
299 | "%d", sg); | |
300 | if (err) { | |
301 | message = "writing feature-gso-tcpv4"; | |
302 | goto abort_transaction; | |
303 | } | |
304 | ||
a9468587 PD |
305 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv6", |
306 | "%d", sg); | |
307 | if (err) { | |
308 | message = "writing feature-gso-tcpv6"; | |
309 | goto abort_transaction; | |
310 | } | |
311 | ||
2eba61d5 PD |
312 | /* We support partial checksum setup for IPv6 packets */ |
313 | err = xenbus_printf(xbt, dev->nodename, | |
314 | "feature-ipv6-csum-offload", | |
315 | "%d", 1); | |
316 | if (err) { | |
317 | message = "writing feature-ipv6-csum-offload"; | |
318 | goto abort_transaction; | |
319 | } | |
320 | ||
f942dc25 IC |
321 | /* We support rx-copy path. */ |
322 | err = xenbus_printf(xbt, dev->nodename, | |
323 | "feature-rx-copy", "%d", 1); | |
324 | if (err) { | |
325 | message = "writing feature-rx-copy"; | |
326 | goto abort_transaction; | |
327 | } | |
328 | ||
329 | /* | |
330 | * We don't support rx-flip path (except old guests who don't | |
331 | * grok this feature flag). | |
332 | */ | |
333 | err = xenbus_printf(xbt, dev->nodename, | |
334 | "feature-rx-flip", "%d", 0); | |
335 | if (err) { | |
336 | message = "writing feature-rx-flip"; | |
337 | goto abort_transaction; | |
338 | } | |
339 | ||
22fae97d | 340 | /* We support dynamic multicast-control. */ |
210c34dc PD |
341 | err = xenbus_printf(xbt, dev->nodename, |
342 | "feature-multicast-control", "%d", 1); | |
343 | if (err) { | |
344 | message = "writing feature-multicast-control"; | |
345 | goto abort_transaction; | |
346 | } | |
347 | ||
22fae97d PD |
348 | err = xenbus_printf(xbt, dev->nodename, |
349 | "feature-dynamic-multicast-control", | |
350 | "%d", 1); | |
351 | if (err) { | |
352 | message = "writing feature-dynamic-multicast-control"; | |
353 | goto abort_transaction; | |
354 | } | |
355 | ||
f942dc25 IC |
356 | err = xenbus_transaction_end(xbt, 0); |
357 | } while (err == -EAGAIN); | |
358 | ||
359 | if (err) { | |
360 | xenbus_dev_fatal(dev, err, "completing transaction"); | |
361 | goto fail; | |
362 | } | |
363 | ||
e1f00a69 WL |
364 | /* |
365 | * Split event channels support, this is optional so it is not | |
366 | * put inside the above loop. | |
367 | */ | |
368 | err = xenbus_printf(XBT_NIL, dev->nodename, | |
369 | "feature-split-event-channels", | |
370 | "%u", separate_tx_rx_irq); | |
371 | if (err) | |
8ef2c3bc | 372 | pr_debug("Error writing feature-split-event-channels\n"); |
e1f00a69 | 373 | |
8d3d53b3 AB |
374 | /* Multi-queue support: This is an optional feature. */ |
375 | err = xenbus_printf(XBT_NIL, dev->nodename, | |
376 | "multi-queue-max-queues", "%u", xenvif_max_queues); | |
377 | if (err) | |
378 | pr_debug("Error writing multi-queue-max-queues\n"); | |
379 | ||
4e15ee2c PD |
380 | err = xenbus_printf(XBT_NIL, dev->nodename, |
381 | "feature-ctrl-ring", | |
382 | "%u", true); | |
383 | if (err) | |
384 | pr_debug("Error writing feature-ctrl-ring\n"); | |
385 | ||
31a41898 IC |
386 | script = xenbus_read(XBT_NIL, dev->nodename, "script", NULL); |
387 | if (IS_ERR(script)) { | |
388 | err = PTR_ERR(script); | |
389 | xenbus_dev_fatal(dev, err, "reading script"); | |
390 | goto fail; | |
391 | } | |
392 | ||
393 | be->hotplug_script = script; | |
394 | ||
ea732dff | 395 | |
f942dc25 | 396 | /* This kicks hotplug scripts, so do it immediately. */ |
2dd34339 AK |
397 | err = backend_create_xenvif(be); |
398 | if (err) | |
399 | goto fail; | |
f942dc25 IC |
400 | |
401 | return 0; | |
402 | ||
403 | abort_transaction: | |
404 | xenbus_transaction_end(xbt, 1); | |
405 | xenbus_dev_fatal(dev, err, "%s", message); | |
406 | fail: | |
8ef2c3bc | 407 | pr_debug("failed\n"); |
f942dc25 IC |
408 | netback_remove(dev); |
409 | return err; | |
410 | } | |
411 | ||
412 | ||
413 | /* | |
414 | * Handle the creation of the hotplug script environment. We add the script | |
415 | * and vif variables to the environment, for the benefit of the vif-* hotplug | |
416 | * scripts. | |
417 | */ | |
418 | static int netback_uevent(struct xenbus_device *xdev, | |
419 | struct kobj_uevent_env *env) | |
420 | { | |
421 | struct backend_info *be = dev_get_drvdata(&xdev->dev); | |
f942dc25 | 422 | |
31a41898 IC |
423 | if (!be) |
424 | return 0; | |
425 | ||
426 | if (add_uevent_var(env, "script=%s", be->hotplug_script)) | |
427 | return -ENOMEM; | |
428 | ||
429 | if (!be->vif) | |
f942dc25 IC |
430 | return 0; |
431 | ||
432 | return add_uevent_var(env, "vif=%s", be->vif->dev->name); | |
433 | } | |
434 | ||
435 | ||
2dd34339 | 436 | static int backend_create_xenvif(struct backend_info *be) |
f942dc25 IC |
437 | { |
438 | int err; | |
439 | long handle; | |
440 | struct xenbus_device *dev = be->dev; | |
f15650b7 | 441 | struct xenvif *vif; |
f942dc25 IC |
442 | |
443 | if (be->vif != NULL) | |
2dd34339 | 444 | return 0; |
f942dc25 IC |
445 | |
446 | err = xenbus_scanf(XBT_NIL, dev->nodename, "handle", "%li", &handle); | |
447 | if (err != 1) { | |
448 | xenbus_dev_fatal(dev, err, "reading handle"); | |
2dd34339 | 449 | return (err < 0) ? err : -EINVAL; |
f942dc25 IC |
450 | } |
451 | ||
f15650b7 JB |
452 | vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle); |
453 | if (IS_ERR(vif)) { | |
454 | err = PTR_ERR(vif); | |
f942dc25 | 455 | xenbus_dev_fatal(dev, err, "creating interface"); |
2dd34339 | 456 | return err; |
f942dc25 | 457 | } |
f15650b7 | 458 | be->vif = vif; |
6dc400af | 459 | vif->be = be; |
f942dc25 IC |
460 | |
461 | kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE); | |
2dd34339 | 462 | return 0; |
f942dc25 IC |
463 | } |
464 | ||
ea732dff | 465 | static void backend_disconnect(struct backend_info *be) |
f942dc25 | 466 | { |
d67ce7da PD |
467 | struct xenvif *vif = be->vif; |
468 | ||
469 | if (vif) { | |
b17075d5 | 470 | unsigned int num_queues = vif->num_queues; |
9a6cdf52 ID |
471 | unsigned int queue_index; |
472 | ||
d67ce7da | 473 | xen_unregister_watchers(vif); |
f51de243 | 474 | #ifdef CONFIG_DEBUG_FS |
d67ce7da | 475 | xenvif_debugfs_delif(vif); |
f51de243 | 476 | #endif /* CONFIG_DEBUG_FS */ |
d67ce7da | 477 | xenvif_disconnect_data(vif); |
d67ce7da | 478 | |
b17075d5 ID |
479 | /* At this point some of the handlers may still be active |
480 | * so we need to have additional synchronization here. | |
481 | */ | |
d67ce7da | 482 | vif->num_queues = 0; |
b17075d5 | 483 | synchronize_net(); |
d67ce7da | 484 | |
b17075d5 ID |
485 | for (queue_index = 0; queue_index < num_queues; ++queue_index) |
486 | xenvif_deinit_queue(&vif->queues[queue_index]); | |
487 | ||
488 | vfree(vif->queues); | |
489 | vif->queues = NULL; | |
a254d8f9 | 490 | |
d67ce7da | 491 | xenvif_disconnect_ctrl(vif); |
f51de243 | 492 | } |
279f438e PD |
493 | } |
494 | ||
ea732dff | 495 | static void backend_connect(struct backend_info *be) |
279f438e | 496 | { |
ea732dff PD |
497 | if (be->vif) |
498 | connect(be); | |
499 | } | |
279f438e | 500 | |
ea732dff PD |
501 | static inline void backend_switch_state(struct backend_info *be, |
502 | enum xenbus_state state) | |
503 | { | |
504 | struct xenbus_device *dev = be->dev; | |
505 | ||
506 | pr_debug("%s -> %s\n", dev->nodename, xenbus_strstate(state)); | |
507 | be->state = state; | |
508 | ||
509 | /* If we are waiting for a hotplug script then defer the | |
510 | * actual xenbus state change. | |
511 | */ | |
512 | if (!be->have_hotplug_status_watch) | |
513 | xenbus_switch_state(dev, state); | |
514 | } | |
515 | ||
516 | /* Handle backend state transitions: | |
517 | * | |
cce94483 | 518 | * The backend state starts in Initialising and the following transitions are |
ea732dff PD |
519 | * allowed. |
520 | * | |
cce94483 FM |
521 | * Initialising -> InitWait -> Connected |
522 | * \ | |
523 | * \ ^ \ | | |
524 | * \ | \ | | |
525 | * \ | \ | | |
526 | * \ | \ | | |
527 | * \ | \ | | |
528 | * \ | \ | | |
529 | * V | V V | |
ea732dff | 530 | * |
cce94483 | 531 | * Closed <-> Closing |
ea732dff PD |
532 | * |
533 | * The state argument specifies the eventual state of the backend and the | |
534 | * function transitions to that state via the shortest path. | |
535 | */ | |
536 | static void set_backend_state(struct backend_info *be, | |
537 | enum xenbus_state state) | |
538 | { | |
539 | while (be->state != state) { | |
540 | switch (be->state) { | |
cce94483 FM |
541 | case XenbusStateInitialising: |
542 | switch (state) { | |
543 | case XenbusStateInitWait: | |
544 | case XenbusStateConnected: | |
545 | case XenbusStateClosing: | |
546 | backend_switch_state(be, XenbusStateInitWait); | |
547 | break; | |
548 | case XenbusStateClosed: | |
549 | backend_switch_state(be, XenbusStateClosed); | |
550 | break; | |
551 | default: | |
552 | BUG(); | |
553 | } | |
554 | break; | |
ea732dff PD |
555 | case XenbusStateClosed: |
556 | switch (state) { | |
557 | case XenbusStateInitWait: | |
558 | case XenbusStateConnected: | |
ea732dff PD |
559 | backend_switch_state(be, XenbusStateInitWait); |
560 | break; | |
561 | case XenbusStateClosing: | |
562 | backend_switch_state(be, XenbusStateClosing); | |
563 | break; | |
564 | default: | |
565 | BUG(); | |
566 | } | |
567 | break; | |
568 | case XenbusStateInitWait: | |
569 | switch (state) { | |
570 | case XenbusStateConnected: | |
571 | backend_connect(be); | |
572 | backend_switch_state(be, XenbusStateConnected); | |
573 | break; | |
574 | case XenbusStateClosing: | |
575 | case XenbusStateClosed: | |
576 | backend_switch_state(be, XenbusStateClosing); | |
577 | break; | |
578 | default: | |
579 | BUG(); | |
580 | } | |
581 | break; | |
582 | case XenbusStateConnected: | |
583 | switch (state) { | |
584 | case XenbusStateInitWait: | |
585 | case XenbusStateClosing: | |
586 | case XenbusStateClosed: | |
587 | backend_disconnect(be); | |
588 | backend_switch_state(be, XenbusStateClosing); | |
589 | break; | |
590 | default: | |
591 | BUG(); | |
592 | } | |
593 | break; | |
594 | case XenbusStateClosing: | |
595 | switch (state) { | |
596 | case XenbusStateInitWait: | |
597 | case XenbusStateConnected: | |
598 | case XenbusStateClosed: | |
599 | backend_switch_state(be, XenbusStateClosed); | |
600 | break; | |
601 | default: | |
602 | BUG(); | |
603 | } | |
604 | break; | |
605 | default: | |
606 | BUG(); | |
607 | } | |
f942dc25 IC |
608 | } |
609 | } | |
610 | ||
611 | /** | |
612 | * Callback received when the frontend's state changes. | |
613 | */ | |
614 | static void frontend_changed(struct xenbus_device *dev, | |
615 | enum xenbus_state frontend_state) | |
616 | { | |
617 | struct backend_info *be = dev_get_drvdata(&dev->dev); | |
618 | ||
ea732dff | 619 | pr_debug("%s -> %s\n", dev->otherend, xenbus_strstate(frontend_state)); |
f942dc25 IC |
620 | |
621 | be->frontend_state = frontend_state; | |
622 | ||
623 | switch (frontend_state) { | |
624 | case XenbusStateInitialising: | |
ea732dff | 625 | set_backend_state(be, XenbusStateInitWait); |
f942dc25 IC |
626 | break; |
627 | ||
628 | case XenbusStateInitialised: | |
629 | break; | |
630 | ||
631 | case XenbusStateConnected: | |
ea732dff | 632 | set_backend_state(be, XenbusStateConnected); |
f942dc25 IC |
633 | break; |
634 | ||
635 | case XenbusStateClosing: | |
ea732dff | 636 | set_backend_state(be, XenbusStateClosing); |
f942dc25 IC |
637 | break; |
638 | ||
639 | case XenbusStateClosed: | |
ea732dff | 640 | set_backend_state(be, XenbusStateClosed); |
f942dc25 IC |
641 | if (xenbus_dev_is_online(dev)) |
642 | break; | |
7499a288 | 643 | /* fall through - if not online */ |
f942dc25 | 644 | case XenbusStateUnknown: |
ea732dff | 645 | set_backend_state(be, XenbusStateClosed); |
f942dc25 IC |
646 | device_unregister(&dev->dev); |
647 | break; | |
648 | ||
649 | default: | |
650 | xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend", | |
651 | frontend_state); | |
652 | break; | |
653 | } | |
654 | } | |
655 | ||
656 | ||
657 | static void xen_net_read_rate(struct xenbus_device *dev, | |
658 | unsigned long *bytes, unsigned long *usec) | |
659 | { | |
660 | char *s, *e; | |
661 | unsigned long b, u; | |
662 | char *ratestr; | |
663 | ||
664 | /* Default to unlimited bandwidth. */ | |
665 | *bytes = ~0UL; | |
666 | *usec = 0; | |
667 | ||
668 | ratestr = xenbus_read(XBT_NIL, dev->nodename, "rate", NULL); | |
669 | if (IS_ERR(ratestr)) | |
670 | return; | |
671 | ||
672 | s = ratestr; | |
673 | b = simple_strtoul(s, &e, 10); | |
674 | if ((s == e) || (*e != ',')) | |
675 | goto fail; | |
676 | ||
677 | s = e + 1; | |
678 | u = simple_strtoul(s, &e, 10); | |
679 | if ((s == e) || (*e != '\0')) | |
680 | goto fail; | |
681 | ||
682 | *bytes = b; | |
683 | *usec = u; | |
684 | ||
685 | kfree(ratestr); | |
686 | return; | |
687 | ||
688 | fail: | |
689 | pr_warn("Failed to parse network rate limit. Traffic unlimited.\n"); | |
690 | kfree(ratestr); | |
691 | } | |
692 | ||
693 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | |
694 | { | |
695 | char *s, *e, *macstr; | |
696 | int i; | |
697 | ||
698 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | |
699 | if (IS_ERR(macstr)) | |
700 | return PTR_ERR(macstr); | |
701 | ||
702 | for (i = 0; i < ETH_ALEN; i++) { | |
703 | mac[i] = simple_strtoul(s, &e, 16); | |
704 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | |
705 | kfree(macstr); | |
706 | return -ENOENT; | |
707 | } | |
708 | s = e+1; | |
709 | } | |
710 | ||
711 | kfree(macstr); | |
712 | return 0; | |
713 | } | |
714 | ||
edafc132 | 715 | static void xen_net_rate_changed(struct xenbus_watch *watch, |
5584ea25 | 716 | const char *path, const char *token) |
edafc132 PI |
717 | { |
718 | struct xenvif *vif = container_of(watch, struct xenvif, credit_watch); | |
719 | struct xenbus_device *dev = xenvif_to_xenbus_device(vif); | |
720 | unsigned long credit_bytes; | |
721 | unsigned long credit_usec; | |
722 | unsigned int queue_index; | |
723 | ||
724 | xen_net_read_rate(dev, &credit_bytes, &credit_usec); | |
725 | for (queue_index = 0; queue_index < vif->num_queues; queue_index++) { | |
726 | struct xenvif_queue *queue = &vif->queues[queue_index]; | |
727 | ||
728 | queue->credit_bytes = credit_bytes; | |
729 | queue->credit_usec = credit_usec; | |
730 | if (!mod_timer_pending(&queue->credit_timeout, jiffies) && | |
731 | queue->remaining_credit > queue->credit_bytes) { | |
732 | queue->remaining_credit = queue->credit_bytes; | |
733 | } | |
734 | } | |
735 | } | |
736 | ||
22fae97d PD |
737 | static int xen_register_credit_watch(struct xenbus_device *dev, |
738 | struct xenvif *vif) | |
edafc132 PI |
739 | { |
740 | int err = 0; | |
741 | char *node; | |
742 | unsigned maxlen = strlen(dev->nodename) + sizeof("/rate"); | |
743 | ||
12b322ac PI |
744 | if (vif->credit_watch.node) |
745 | return -EADDRINUSE; | |
746 | ||
edafc132 PI |
747 | node = kmalloc(maxlen, GFP_KERNEL); |
748 | if (!node) | |
749 | return -ENOMEM; | |
750 | snprintf(node, maxlen, "%s/rate", dev->nodename); | |
751 | vif->credit_watch.node = node; | |
752 | vif->credit_watch.callback = xen_net_rate_changed; | |
753 | err = register_xenbus_watch(&vif->credit_watch); | |
754 | if (err) { | |
755 | pr_err("Failed to set watcher %s\n", vif->credit_watch.node); | |
756 | kfree(node); | |
757 | vif->credit_watch.node = NULL; | |
758 | vif->credit_watch.callback = NULL; | |
759 | } | |
760 | return err; | |
761 | } | |
762 | ||
22fae97d | 763 | static void xen_unregister_credit_watch(struct xenvif *vif) |
edafc132 PI |
764 | { |
765 | if (vif->credit_watch.node) { | |
766 | unregister_xenbus_watch(&vif->credit_watch); | |
767 | kfree(vif->credit_watch.node); | |
768 | vif->credit_watch.node = NULL; | |
769 | } | |
770 | } | |
771 | ||
22fae97d | 772 | static void xen_mcast_ctrl_changed(struct xenbus_watch *watch, |
5584ea25 | 773 | const char *path, const char *token) |
22fae97d PD |
774 | { |
775 | struct xenvif *vif = container_of(watch, struct xenvif, | |
776 | mcast_ctrl_watch); | |
777 | struct xenbus_device *dev = xenvif_to_xenbus_device(vif); | |
22fae97d | 778 | |
f95842e7 JG |
779 | vif->multicast_control = !!xenbus_read_unsigned(dev->otherend, |
780 | "request-multicast-control", 0); | |
22fae97d PD |
781 | } |
782 | ||
783 | static int xen_register_mcast_ctrl_watch(struct xenbus_device *dev, | |
784 | struct xenvif *vif) | |
785 | { | |
786 | int err = 0; | |
787 | char *node; | |
788 | unsigned maxlen = strlen(dev->otherend) + | |
789 | sizeof("/request-multicast-control"); | |
790 | ||
791 | if (vif->mcast_ctrl_watch.node) { | |
792 | pr_err_ratelimited("Watch is already registered\n"); | |
793 | return -EADDRINUSE; | |
794 | } | |
795 | ||
796 | node = kmalloc(maxlen, GFP_KERNEL); | |
797 | if (!node) { | |
798 | pr_err("Failed to allocate memory for watch\n"); | |
799 | return -ENOMEM; | |
800 | } | |
801 | snprintf(node, maxlen, "%s/request-multicast-control", | |
802 | dev->otherend); | |
803 | vif->mcast_ctrl_watch.node = node; | |
804 | vif->mcast_ctrl_watch.callback = xen_mcast_ctrl_changed; | |
805 | err = register_xenbus_watch(&vif->mcast_ctrl_watch); | |
806 | if (err) { | |
807 | pr_err("Failed to set watcher %s\n", | |
808 | vif->mcast_ctrl_watch.node); | |
809 | kfree(node); | |
810 | vif->mcast_ctrl_watch.node = NULL; | |
811 | vif->mcast_ctrl_watch.callback = NULL; | |
812 | } | |
813 | return err; | |
814 | } | |
815 | ||
816 | static void xen_unregister_mcast_ctrl_watch(struct xenvif *vif) | |
817 | { | |
818 | if (vif->mcast_ctrl_watch.node) { | |
819 | unregister_xenbus_watch(&vif->mcast_ctrl_watch); | |
820 | kfree(vif->mcast_ctrl_watch.node); | |
821 | vif->mcast_ctrl_watch.node = NULL; | |
822 | } | |
823 | } | |
824 | ||
825 | static void xen_register_watchers(struct xenbus_device *dev, | |
826 | struct xenvif *vif) | |
827 | { | |
828 | xen_register_credit_watch(dev, vif); | |
829 | xen_register_mcast_ctrl_watch(dev, vif); | |
830 | } | |
831 | ||
832 | static void xen_unregister_watchers(struct xenvif *vif) | |
833 | { | |
834 | xen_unregister_mcast_ctrl_watch(vif); | |
835 | xen_unregister_credit_watch(vif); | |
836 | } | |
837 | ||
f942dc25 IC |
838 | static void unregister_hotplug_status_watch(struct backend_info *be) |
839 | { | |
840 | if (be->have_hotplug_status_watch) { | |
841 | unregister_xenbus_watch(&be->hotplug_status_watch); | |
842 | kfree(be->hotplug_status_watch.node); | |
843 | } | |
844 | be->have_hotplug_status_watch = 0; | |
845 | } | |
846 | ||
847 | static void hotplug_status_changed(struct xenbus_watch *watch, | |
5584ea25 JG |
848 | const char *path, |
849 | const char *token) | |
f942dc25 IC |
850 | { |
851 | struct backend_info *be = container_of(watch, | |
852 | struct backend_info, | |
853 | hotplug_status_watch); | |
854 | char *str; | |
855 | unsigned int len; | |
856 | ||
857 | str = xenbus_read(XBT_NIL, be->dev->nodename, "hotplug-status", &len); | |
858 | if (IS_ERR(str)) | |
859 | return; | |
860 | if (len == sizeof("connected")-1 && !memcmp(str, "connected", len)) { | |
ea732dff PD |
861 | /* Complete any pending state change */ |
862 | xenbus_switch_state(be->dev, be->state); | |
863 | ||
f942dc25 IC |
864 | /* Not interested in this watch anymore. */ |
865 | unregister_hotplug_status_watch(be); | |
866 | } | |
867 | kfree(str); | |
868 | } | |
869 | ||
4e15ee2c PD |
870 | static int connect_ctrl_ring(struct backend_info *be) |
871 | { | |
872 | struct xenbus_device *dev = be->dev; | |
873 | struct xenvif *vif = be->vif; | |
874 | unsigned int val; | |
875 | grant_ref_t ring_ref; | |
876 | unsigned int evtchn; | |
877 | int err; | |
878 | ||
6c27f99d JB |
879 | err = xenbus_scanf(XBT_NIL, dev->otherend, |
880 | "ctrl-ring-ref", "%u", &val); | |
881 | if (err < 0) | |
4e15ee2c PD |
882 | goto done; /* The frontend does not have a control ring */ |
883 | ||
884 | ring_ref = val; | |
885 | ||
6c27f99d JB |
886 | err = xenbus_scanf(XBT_NIL, dev->otherend, |
887 | "event-channel-ctrl", "%u", &val); | |
888 | if (err < 0) { | |
4e15ee2c PD |
889 | xenbus_dev_fatal(dev, err, |
890 | "reading %s/event-channel-ctrl", | |
891 | dev->otherend); | |
892 | goto fail; | |
893 | } | |
894 | ||
895 | evtchn = val; | |
896 | ||
897 | err = xenvif_connect_ctrl(vif, ring_ref, evtchn); | |
898 | if (err) { | |
899 | xenbus_dev_fatal(dev, err, | |
900 | "mapping shared-frame %u port %u", | |
901 | ring_ref, evtchn); | |
902 | goto fail; | |
903 | } | |
904 | ||
905 | done: | |
906 | return 0; | |
907 | ||
908 | fail: | |
909 | return err; | |
910 | } | |
911 | ||
f942dc25 IC |
912 | static void connect(struct backend_info *be) |
913 | { | |
914 | int err; | |
915 | struct xenbus_device *dev = be->dev; | |
e9ce7cb6 WL |
916 | unsigned long credit_bytes, credit_usec; |
917 | unsigned int queue_index; | |
8d3d53b3 | 918 | unsigned int requested_num_queues; |
e9ce7cb6 | 919 | struct xenvif_queue *queue; |
f942dc25 | 920 | |
8d3d53b3 AB |
921 | /* Check whether the frontend requested multiple queues |
922 | * and read the number requested. | |
923 | */ | |
f95842e7 JG |
924 | requested_num_queues = xenbus_read_unsigned(dev->otherend, |
925 | "multi-queue-num-queues", 1); | |
926 | if (requested_num_queues > xenvif_max_queues) { | |
8d3d53b3 | 927 | /* buggy or malicious guest */ |
0f06ac3b | 928 | xenbus_dev_fatal(dev, -EINVAL, |
8d3d53b3 AB |
929 | "guest requested %u queues, exceeding the maximum of %u.", |
930 | requested_num_queues, xenvif_max_queues); | |
931 | return; | |
932 | } | |
933 | ||
f942dc25 IC |
934 | err = xen_net_read_mac(dev, be->vif->fe_dev_addr); |
935 | if (err) { | |
936 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | |
937 | return; | |
938 | } | |
939 | ||
e9ce7cb6 | 940 | xen_net_read_rate(dev, &credit_bytes, &credit_usec); |
12b322ac | 941 | xen_unregister_watchers(be->vif); |
edafc132 | 942 | xen_register_watchers(dev, be->vif); |
e9ce7cb6 WL |
943 | read_xenbus_vif_flags(be); |
944 | ||
4e15ee2c PD |
945 | err = connect_ctrl_ring(be); |
946 | if (err) { | |
947 | xenbus_dev_fatal(dev, err, "connecting control ring"); | |
948 | return; | |
949 | } | |
950 | ||
8d3d53b3 | 951 | /* Use the number of queues requested by the frontend */ |
fad953ce KC |
952 | be->vif->queues = vzalloc(array_size(requested_num_queues, |
953 | sizeof(struct xenvif_queue))); | |
833b8f18 IY |
954 | if (!be->vif->queues) { |
955 | xenbus_dev_fatal(dev, -ENOMEM, | |
956 | "allocating queues"); | |
957 | return; | |
958 | } | |
959 | ||
f7b50c4e | 960 | be->vif->num_queues = requested_num_queues; |
ecf08d2d | 961 | be->vif->stalled_queues = requested_num_queues; |
e9ce7cb6 WL |
962 | |
963 | for (queue_index = 0; queue_index < requested_num_queues; ++queue_index) { | |
964 | queue = &be->vif->queues[queue_index]; | |
965 | queue->vif = be->vif; | |
966 | queue->id = queue_index; | |
967 | snprintf(queue->name, sizeof(queue->name), "%s-q%u", | |
968 | be->vif->dev->name, queue->id); | |
969 | ||
970 | err = xenvif_init_queue(queue); | |
8d3d53b3 AB |
971 | if (err) { |
972 | /* xenvif_init_queue() cleans up after itself on | |
973 | * failure, but we need to clean up any previously | |
974 | * initialised queues. Set num_queues to i so that | |
975 | * earlier queues can be destroyed using the regular | |
976 | * disconnect logic. | |
977 | */ | |
f7b50c4e | 978 | be->vif->num_queues = queue_index; |
e9ce7cb6 | 979 | goto err; |
8d3d53b3 | 980 | } |
e9ce7cb6 | 981 | |
ce0e5c52 | 982 | queue->credit_bytes = credit_bytes; |
e9ce7cb6 | 983 | queue->remaining_credit = credit_bytes; |
07ff890d | 984 | queue->credit_usec = credit_usec; |
e9ce7cb6 | 985 | |
4e15ee2c | 986 | err = connect_data_rings(be, queue); |
8d3d53b3 | 987 | if (err) { |
4e15ee2c PD |
988 | /* connect_data_rings() cleans up after itself on |
989 | * failure, but we need to clean up after | |
990 | * xenvif_init_queue() here, and also clean up any | |
991 | * previously initialised queues. | |
8d3d53b3 AB |
992 | */ |
993 | xenvif_deinit_queue(queue); | |
f7b50c4e | 994 | be->vif->num_queues = queue_index; |
e9ce7cb6 | 995 | goto err; |
8d3d53b3 | 996 | } |
628fa76b WL |
997 | } |
998 | ||
f51de243 | 999 | #ifdef CONFIG_DEBUG_FS |
628fa76b | 1000 | xenvif_debugfs_addif(be->vif); |
f51de243 | 1001 | #endif /* CONFIG_DEBUG_FS */ |
e9ce7cb6 | 1002 | |
f7b50c4e WL |
1003 | /* Initialisation completed, tell core driver the number of |
1004 | * active queues. | |
1005 | */ | |
1006 | rtnl_lock(); | |
1007 | netif_set_real_num_tx_queues(be->vif->dev, requested_num_queues); | |
1008 | netif_set_real_num_rx_queues(be->vif->dev, requested_num_queues); | |
1009 | rtnl_unlock(); | |
1010 | ||
e9ce7cb6 | 1011 | xenvif_carrier_on(be->vif); |
f942dc25 IC |
1012 | |
1013 | unregister_hotplug_status_watch(be); | |
1014 | err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch, | |
1015 | hotplug_status_changed, | |
1016 | "%s/%s", dev->nodename, "hotplug-status"); | |
ea732dff | 1017 | if (!err) |
f942dc25 | 1018 | be->have_hotplug_status_watch = 1; |
f942dc25 | 1019 | |
e9ce7cb6 WL |
1020 | netif_tx_wake_all_queues(be->vif->dev); |
1021 | ||
1022 | return; | |
1023 | ||
1024 | err: | |
f7b50c4e | 1025 | if (be->vif->num_queues > 0) |
4e15ee2c | 1026 | xenvif_disconnect_data(be->vif); /* Clean up existing queues */ |
9a6cdf52 ID |
1027 | for (queue_index = 0; queue_index < be->vif->num_queues; ++queue_index) |
1028 | xenvif_deinit_queue(&be->vif->queues[queue_index]); | |
e9ce7cb6 WL |
1029 | vfree(be->vif->queues); |
1030 | be->vif->queues = NULL; | |
f7b50c4e | 1031 | be->vif->num_queues = 0; |
4e15ee2c | 1032 | xenvif_disconnect_ctrl(be->vif); |
e9ce7cb6 | 1033 | return; |
f942dc25 IC |
1034 | } |
1035 | ||
1036 | ||
4e15ee2c PD |
1037 | static int connect_data_rings(struct backend_info *be, |
1038 | struct xenvif_queue *queue) | |
f942dc25 | 1039 | { |
f942dc25 | 1040 | struct xenbus_device *dev = be->dev; |
f7b50c4e | 1041 | unsigned int num_queues = queue->vif->num_queues; |
f942dc25 | 1042 | unsigned long tx_ring_ref, rx_ring_ref; |
e9ce7cb6 | 1043 | unsigned int tx_evtchn, rx_evtchn; |
f942dc25 | 1044 | int err; |
8d3d53b3 AB |
1045 | char *xspath; |
1046 | size_t xspathsize; | |
1047 | const size_t xenstore_path_ext_size = 11; /* sufficient for "/queue-NNN" */ | |
1048 | ||
1049 | /* If the frontend requested 1 queue, or we have fallen back | |
1050 | * to single queue due to lack of frontend support for multi- | |
1051 | * queue, expect the remaining XenStore keys in the toplevel | |
1052 | * directory. Otherwise, expect them in a subdirectory called | |
1053 | * queue-N. | |
1054 | */ | |
1055 | if (num_queues == 1) { | |
1056 | xspath = kzalloc(strlen(dev->otherend) + 1, GFP_KERNEL); | |
1057 | if (!xspath) { | |
1058 | xenbus_dev_fatal(dev, -ENOMEM, | |
1059 | "reading ring references"); | |
1060 | return -ENOMEM; | |
1061 | } | |
1062 | strcpy(xspath, dev->otherend); | |
1063 | } else { | |
1064 | xspathsize = strlen(dev->otherend) + xenstore_path_ext_size; | |
1065 | xspath = kzalloc(xspathsize, GFP_KERNEL); | |
1066 | if (!xspath) { | |
1067 | xenbus_dev_fatal(dev, -ENOMEM, | |
1068 | "reading ring references"); | |
1069 | return -ENOMEM; | |
1070 | } | |
1071 | snprintf(xspath, xspathsize, "%s/queue-%u", dev->otherend, | |
1072 | queue->id); | |
1073 | } | |
f942dc25 | 1074 | |
8d3d53b3 | 1075 | err = xenbus_gather(XBT_NIL, xspath, |
f942dc25 | 1076 | "tx-ring-ref", "%lu", &tx_ring_ref, |
e1f00a69 | 1077 | "rx-ring-ref", "%lu", &rx_ring_ref, NULL); |
f942dc25 IC |
1078 | if (err) { |
1079 | xenbus_dev_fatal(dev, err, | |
e1f00a69 | 1080 | "reading %s/ring-ref", |
8d3d53b3 AB |
1081 | xspath); |
1082 | goto err; | |
f942dc25 IC |
1083 | } |
1084 | ||
e1f00a69 | 1085 | /* Try split event channels first, then single event channel. */ |
8d3d53b3 | 1086 | err = xenbus_gather(XBT_NIL, xspath, |
e1f00a69 WL |
1087 | "event-channel-tx", "%u", &tx_evtchn, |
1088 | "event-channel-rx", "%u", &rx_evtchn, NULL); | |
1089 | if (err < 0) { | |
8d3d53b3 | 1090 | err = xenbus_scanf(XBT_NIL, xspath, |
e1f00a69 WL |
1091 | "event-channel", "%u", &tx_evtchn); |
1092 | if (err < 0) { | |
1093 | xenbus_dev_fatal(dev, err, | |
1094 | "reading %s/event-channel(-tx/rx)", | |
8d3d53b3 AB |
1095 | xspath); |
1096 | goto err; | |
e1f00a69 WL |
1097 | } |
1098 | rx_evtchn = tx_evtchn; | |
1099 | } | |
1100 | ||
e9ce7cb6 | 1101 | /* Map the shared frame, irq etc. */ |
4e15ee2c PD |
1102 | err = xenvif_connect_data(queue, tx_ring_ref, rx_ring_ref, |
1103 | tx_evtchn, rx_evtchn); | |
e9ce7cb6 WL |
1104 | if (err) { |
1105 | xenbus_dev_fatal(dev, err, | |
1106 | "mapping shared-frames %lu/%lu port tx %u rx %u", | |
1107 | tx_ring_ref, rx_ring_ref, | |
1108 | tx_evtchn, rx_evtchn); | |
8d3d53b3 | 1109 | goto err; |
e9ce7cb6 WL |
1110 | } |
1111 | ||
8d3d53b3 AB |
1112 | err = 0; |
1113 | err: /* Regular return falls through with err == 0 */ | |
1114 | kfree(xspath); | |
1115 | return err; | |
e9ce7cb6 WL |
1116 | } |
1117 | ||
1118 | static int read_xenbus_vif_flags(struct backend_info *be) | |
1119 | { | |
1120 | struct xenvif *vif = be->vif; | |
1121 | struct xenbus_device *dev = be->dev; | |
1122 | unsigned int rx_copy; | |
f95842e7 | 1123 | int err; |
e9ce7cb6 | 1124 | |
f942dc25 IC |
1125 | err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u", |
1126 | &rx_copy); | |
1127 | if (err == -ENOENT) { | |
1128 | err = 0; | |
1129 | rx_copy = 0; | |
1130 | } | |
1131 | if (err < 0) { | |
1132 | xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy", | |
1133 | dev->otherend); | |
1134 | return err; | |
1135 | } | |
1136 | if (!rx_copy) | |
1137 | return -EOPNOTSUPP; | |
1138 | ||
f95842e7 | 1139 | if (!xenbus_read_unsigned(dev->otherend, "feature-rx-notify", 0)) { |
26c0e102 DV |
1140 | /* - Reduce drain timeout to poll more frequently for |
1141 | * Rx requests. | |
1142 | * - Disable Rx stall detection. | |
1143 | */ | |
1144 | be->vif->drain_timeout = msecs_to_jiffies(30); | |
1145 | be->vif->stall_timeout = 0; | |
f942dc25 IC |
1146 | } |
1147 | ||
f95842e7 | 1148 | vif->can_sg = !!xenbus_read_unsigned(dev->otherend, "feature-sg", 0); |
f942dc25 | 1149 | |
82cada22 | 1150 | vif->gso_mask = 0; |
82cada22 | 1151 | |
f95842e7 | 1152 | if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv4", 0)) |
82cada22 | 1153 | vif->gso_mask |= GSO_BIT(TCPV4); |
f942dc25 | 1154 | |
f95842e7 | 1155 | if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv6", 0)) |
82cada22 PD |
1156 | vif->gso_mask |= GSO_BIT(TCPV6); |
1157 | ||
f95842e7 JG |
1158 | vif->ip_csum = !xenbus_read_unsigned(dev->otherend, |
1159 | "feature-no-csum-offload", 0); | |
146c8a77 | 1160 | |
f95842e7 JG |
1161 | vif->ipv6_csum = !!xenbus_read_unsigned(dev->otherend, |
1162 | "feature-ipv6-csum-offload", 0); | |
f942dc25 | 1163 | |
f942dc25 IC |
1164 | return 0; |
1165 | } | |
1166 | ||
f942dc25 IC |
1167 | static const struct xenbus_device_id netback_ids[] = { |
1168 | { "vif" }, | |
1169 | { "" } | |
1170 | }; | |
1171 | ||
95afae48 DV |
1172 | static struct xenbus_driver netback_driver = { |
1173 | .ids = netback_ids, | |
f942dc25 IC |
1174 | .probe = netback_probe, |
1175 | .remove = netback_remove, | |
1176 | .uevent = netback_uevent, | |
1177 | .otherend_changed = frontend_changed, | |
95afae48 | 1178 | }; |
f942dc25 IC |
1179 | |
1180 | int xenvif_xenbus_init(void) | |
1181 | { | |
73db144b | 1182 | return xenbus_register_backend(&netback_driver); |
f942dc25 | 1183 | } |
b103f358 WL |
1184 | |
1185 | void xenvif_xenbus_fini(void) | |
1186 | { | |
1187 | return xenbus_unregister_driver(&netback_driver); | |
1188 | } |