Commit | Line | Data |
---|---|---|
1ccea77e | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f942dc25 IC |
2 | /* |
3 | * Xenbus code for netif backend | |
4 | * | |
5 | * Copyright (C) 2005 Rusty Russell <rusty@rustcorp.com.au> | |
6 | * Copyright (C) 2005 XenSource Ltd | |
f942dc25 IC |
7 | */ |
8 | ||
9 | #include "common.h" | |
e9ce7cb6 WL |
10 | #include <linux/vmalloc.h> |
11 | #include <linux/rtnetlink.h> | |
f942dc25 | 12 | |
4e15ee2c PD |
13 | static int connect_data_rings(struct backend_info *be, |
14 | struct xenvif_queue *queue); | |
e9ce7cb6 WL |
15 | static void connect(struct backend_info *be); |
16 | static int read_xenbus_vif_flags(struct backend_info *be); | |
2dd34339 | 17 | static int backend_create_xenvif(struct backend_info *be); |
f942dc25 | 18 | static void unregister_hotplug_status_watch(struct backend_info *be); |
edafc132 | 19 | static void xen_unregister_watchers(struct xenvif *vif); |
dc62ccac DV |
20 | static void set_backend_state(struct backend_info *be, |
21 | enum xenbus_state state); | |
f942dc25 | 22 | |
f51de243 ZK |
23 | #ifdef CONFIG_DEBUG_FS |
24 | struct dentry *xen_netback_dbg_root = NULL; | |
25 | ||
26 | static int xenvif_read_io_ring(struct seq_file *m, void *v) | |
27 | { | |
28 | struct xenvif_queue *queue = m->private; | |
29 | struct xen_netif_tx_back_ring *tx_ring = &queue->tx; | |
30 | struct xen_netif_rx_back_ring *rx_ring = &queue->rx; | |
f48da8b1 | 31 | struct netdev_queue *dev_queue; |
f51de243 ZK |
32 | |
33 | if (tx_ring->sring) { | |
34 | struct xen_netif_tx_sring *sring = tx_ring->sring; | |
35 | ||
36 | seq_printf(m, "Queue %d\nTX: nr_ents %u\n", queue->id, | |
37 | tx_ring->nr_ents); | |
38 | seq_printf(m, "req prod %u (%d) cons %u (%d) event %u (%d)\n", | |
39 | sring->req_prod, | |
40 | sring->req_prod - sring->rsp_prod, | |
41 | tx_ring->req_cons, | |
42 | tx_ring->req_cons - sring->rsp_prod, | |
43 | sring->req_event, | |
44 | sring->req_event - sring->rsp_prod); | |
45 | seq_printf(m, "rsp prod %u (base) pvt %u (%d) event %u (%d)\n", | |
46 | sring->rsp_prod, | |
47 | tx_ring->rsp_prod_pvt, | |
48 | tx_ring->rsp_prod_pvt - sring->rsp_prod, | |
49 | sring->rsp_event, | |
50 | sring->rsp_event - sring->rsp_prod); | |
51 | seq_printf(m, "pending prod %u pending cons %u nr_pending_reqs %u\n", | |
52 | queue->pending_prod, | |
53 | queue->pending_cons, | |
54 | nr_pending_reqs(queue)); | |
55 | seq_printf(m, "dealloc prod %u dealloc cons %u dealloc_queue %u\n\n", | |
56 | queue->dealloc_prod, | |
57 | queue->dealloc_cons, | |
58 | queue->dealloc_prod - queue->dealloc_cons); | |
59 | } | |
60 | ||
61 | if (rx_ring->sring) { | |
62 | struct xen_netif_rx_sring *sring = rx_ring->sring; | |
63 | ||
64 | seq_printf(m, "RX: nr_ents %u\n", rx_ring->nr_ents); | |
65 | seq_printf(m, "req prod %u (%d) cons %u (%d) event %u (%d)\n", | |
66 | sring->req_prod, | |
67 | sring->req_prod - sring->rsp_prod, | |
68 | rx_ring->req_cons, | |
69 | rx_ring->req_cons - sring->rsp_prod, | |
70 | sring->req_event, | |
71 | sring->req_event - sring->rsp_prod); | |
72 | seq_printf(m, "rsp prod %u (base) pvt %u (%d) event %u (%d)\n\n", | |
73 | sring->rsp_prod, | |
74 | rx_ring->rsp_prod_pvt, | |
75 | rx_ring->rsp_prod_pvt - sring->rsp_prod, | |
76 | sring->rsp_event, | |
77 | sring->rsp_event - sring->rsp_prod); | |
78 | } | |
79 | ||
80 | seq_printf(m, "NAPI state: %lx NAPI weight: %d TX queue len %u\n" | |
81 | "Credit timer_pending: %d, credit: %lu, usec: %lu\n" | |
82 | "remaining: %lu, expires: %lu, now: %lu\n", | |
83 | queue->napi.state, queue->napi.weight, | |
84 | skb_queue_len(&queue->tx_queue), | |
85 | timer_pending(&queue->credit_timeout), | |
86 | queue->credit_bytes, | |
87 | queue->credit_usec, | |
88 | queue->remaining_credit, | |
89 | queue->credit_timeout.expires, | |
90 | jiffies); | |
91 | ||
f48da8b1 DV |
92 | dev_queue = netdev_get_tx_queue(queue->vif->dev, queue->id); |
93 | ||
94 | seq_printf(m, "\nRx internal queue: len %u max %u pkts %u %s\n", | |
95 | queue->rx_queue_len, queue->rx_queue_max, | |
96 | skb_queue_len(&queue->rx_queue), | |
97 | netif_tx_queue_stopped(dev_queue) ? "stopped" : "running"); | |
98 | ||
f51de243 ZK |
99 | return 0; |
100 | } | |
101 | ||
102 | #define XENVIF_KICK_STR "kick" | |
5c807005 | 103 | #define BUFFER_SIZE 32 |
f51de243 ZK |
104 | |
105 | static ssize_t | |
106 | xenvif_write_io_ring(struct file *filp, const char __user *buf, size_t count, | |
107 | loff_t *ppos) | |
108 | { | |
109 | struct xenvif_queue *queue = | |
110 | ((struct seq_file *)filp->private_data)->private; | |
111 | int len; | |
5c807005 | 112 | char write[BUFFER_SIZE]; |
f51de243 ZK |
113 | |
114 | /* don't allow partial writes and check the length */ | |
115 | if (*ppos != 0) | |
116 | return 0; | |
5c807005 | 117 | if (count >= sizeof(write)) |
f51de243 ZK |
118 | return -ENOSPC; |
119 | ||
120 | len = simple_write_to_buffer(write, | |
5c807005 | 121 | sizeof(write) - 1, |
f51de243 ZK |
122 | ppos, |
123 | buf, | |
124 | count); | |
125 | if (len < 0) | |
126 | return len; | |
127 | ||
5c807005 WL |
128 | write[len] = '\0'; |
129 | ||
f51de243 ZK |
130 | if (!strncmp(write, XENVIF_KICK_STR, sizeof(XENVIF_KICK_STR) - 1)) |
131 | xenvif_interrupt(0, (void *)queue); | |
132 | else { | |
133 | pr_warn("Unknown command to io_ring_q%d. Available: kick\n", | |
134 | queue->id); | |
135 | count = -EINVAL; | |
136 | } | |
137 | return count; | |
138 | } | |
139 | ||
a9339b8e | 140 | static int xenvif_io_ring_open(struct inode *inode, struct file *filp) |
f51de243 ZK |
141 | { |
142 | int ret; | |
143 | void *queue = NULL; | |
144 | ||
145 | if (inode->i_private) | |
146 | queue = inode->i_private; | |
147 | ret = single_open(filp, xenvif_read_io_ring, queue); | |
148 | filp->f_mode |= FMODE_PWRITE; | |
149 | return ret; | |
150 | } | |
151 | ||
152 | static const struct file_operations xenvif_dbg_io_ring_ops_fops = { | |
153 | .owner = THIS_MODULE, | |
a9339b8e | 154 | .open = xenvif_io_ring_open, |
f51de243 ZK |
155 | .read = seq_read, |
156 | .llseek = seq_lseek, | |
157 | .release = single_release, | |
158 | .write = xenvif_write_io_ring, | |
159 | }; | |
160 | ||
5061e3f4 | 161 | static int xenvif_ctrl_show(struct seq_file *m, void *v) |
a9339b8e PD |
162 | { |
163 | struct xenvif *vif = m->private; | |
164 | ||
165 | xenvif_dump_hash_info(vif, m); | |
166 | ||
167 | return 0; | |
168 | } | |
5061e3f4 | 169 | DEFINE_SHOW_ATTRIBUTE(xenvif_ctrl); |
a9339b8e | 170 | |
628fa76b | 171 | static void xenvif_debugfs_addif(struct xenvif *vif) |
f51de243 | 172 | { |
f51de243 ZK |
173 | int i; |
174 | ||
f51de243 ZK |
175 | vif->xenvif_dbg_root = debugfs_create_dir(vif->dev->name, |
176 | xen_netback_dbg_root); | |
6f20a697 GKH |
177 | for (i = 0; i < vif->num_queues; ++i) { |
178 | char filename[sizeof("io_ring_q") + 4]; | |
179 | ||
180 | snprintf(filename, sizeof(filename), "io_ring_q%d", i); | |
181 | debugfs_create_file(filename, 0600, vif->xenvif_dbg_root, | |
182 | &vif->queues[i], | |
183 | &xenvif_dbg_io_ring_ops_fops); | |
184 | } | |
185 | ||
186 | if (vif->ctrl_irq) | |
187 | debugfs_create_file("ctrl", 0400, vif->xenvif_dbg_root, vif, | |
188 | &xenvif_ctrl_fops); | |
f51de243 ZK |
189 | } |
190 | ||
191 | static void xenvif_debugfs_delif(struct xenvif *vif) | |
192 | { | |
0527097c | 193 | debugfs_remove_recursive(vif->xenvif_dbg_root); |
f51de243 ZK |
194 | vif->xenvif_dbg_root = NULL; |
195 | } | |
196 | #endif /* CONFIG_DEBUG_FS */ | |
197 | ||
f942dc25 IC |
198 | /* |
199 | * Handle the creation of the hotplug script environment. We add the script | |
200 | * and vif variables to the environment, for the benefit of the vif-* hotplug | |
201 | * scripts. | |
202 | */ | |
203 | static int netback_uevent(struct xenbus_device *xdev, | |
204 | struct kobj_uevent_env *env) | |
205 | { | |
206 | struct backend_info *be = dev_get_drvdata(&xdev->dev); | |
f942dc25 | 207 | |
31a41898 IC |
208 | if (!be) |
209 | return 0; | |
210 | ||
211 | if (add_uevent_var(env, "script=%s", be->hotplug_script)) | |
212 | return -ENOMEM; | |
213 | ||
214 | if (!be->vif) | |
f942dc25 IC |
215 | return 0; |
216 | ||
217 | return add_uevent_var(env, "vif=%s", be->vif->dev->name); | |
218 | } | |
219 | ||
220 | ||
2dd34339 | 221 | static int backend_create_xenvif(struct backend_info *be) |
f942dc25 IC |
222 | { |
223 | int err; | |
224 | long handle; | |
225 | struct xenbus_device *dev = be->dev; | |
f15650b7 | 226 | struct xenvif *vif; |
f942dc25 IC |
227 | |
228 | if (be->vif != NULL) | |
2dd34339 | 229 | return 0; |
f942dc25 IC |
230 | |
231 | err = xenbus_scanf(XBT_NIL, dev->nodename, "handle", "%li", &handle); | |
232 | if (err != 1) { | |
233 | xenbus_dev_fatal(dev, err, "reading handle"); | |
2dd34339 | 234 | return (err < 0) ? err : -EINVAL; |
f942dc25 IC |
235 | } |
236 | ||
f15650b7 JB |
237 | vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle); |
238 | if (IS_ERR(vif)) { | |
239 | err = PTR_ERR(vif); | |
f942dc25 | 240 | xenbus_dev_fatal(dev, err, "creating interface"); |
2dd34339 | 241 | return err; |
f942dc25 | 242 | } |
f15650b7 | 243 | be->vif = vif; |
6dc400af | 244 | vif->be = be; |
f942dc25 IC |
245 | |
246 | kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE); | |
2dd34339 | 247 | return 0; |
f942dc25 IC |
248 | } |
249 | ||
ea732dff | 250 | static void backend_disconnect(struct backend_info *be) |
f942dc25 | 251 | { |
d67ce7da PD |
252 | struct xenvif *vif = be->vif; |
253 | ||
254 | if (vif) { | |
b17075d5 | 255 | unsigned int num_queues = vif->num_queues; |
9a6cdf52 ID |
256 | unsigned int queue_index; |
257 | ||
d67ce7da | 258 | xen_unregister_watchers(vif); |
f51de243 | 259 | #ifdef CONFIG_DEBUG_FS |
d67ce7da | 260 | xenvif_debugfs_delif(vif); |
f51de243 | 261 | #endif /* CONFIG_DEBUG_FS */ |
d67ce7da | 262 | xenvif_disconnect_data(vif); |
d67ce7da | 263 | |
b17075d5 ID |
264 | /* At this point some of the handlers may still be active |
265 | * so we need to have additional synchronization here. | |
266 | */ | |
d67ce7da | 267 | vif->num_queues = 0; |
b17075d5 | 268 | synchronize_net(); |
d67ce7da | 269 | |
b17075d5 ID |
270 | for (queue_index = 0; queue_index < num_queues; ++queue_index) |
271 | xenvif_deinit_queue(&vif->queues[queue_index]); | |
272 | ||
273 | vfree(vif->queues); | |
274 | vif->queues = NULL; | |
a254d8f9 | 275 | |
d67ce7da | 276 | xenvif_disconnect_ctrl(vif); |
f51de243 | 277 | } |
279f438e PD |
278 | } |
279 | ||
ea732dff | 280 | static void backend_connect(struct backend_info *be) |
279f438e | 281 | { |
ea732dff PD |
282 | if (be->vif) |
283 | connect(be); | |
284 | } | |
279f438e | 285 | |
ea732dff PD |
286 | static inline void backend_switch_state(struct backend_info *be, |
287 | enum xenbus_state state) | |
288 | { | |
289 | struct xenbus_device *dev = be->dev; | |
290 | ||
291 | pr_debug("%s -> %s\n", dev->nodename, xenbus_strstate(state)); | |
292 | be->state = state; | |
293 | ||
294 | /* If we are waiting for a hotplug script then defer the | |
295 | * actual xenbus state change. | |
296 | */ | |
297 | if (!be->have_hotplug_status_watch) | |
298 | xenbus_switch_state(dev, state); | |
299 | } | |
300 | ||
301 | /* Handle backend state transitions: | |
302 | * | |
cce94483 | 303 | * The backend state starts in Initialising and the following transitions are |
ea732dff PD |
304 | * allowed. |
305 | * | |
cce94483 FM |
306 | * Initialising -> InitWait -> Connected |
307 | * \ | |
308 | * \ ^ \ | | |
309 | * \ | \ | | |
310 | * \ | \ | | |
311 | * \ | \ | | |
312 | * \ | \ | | |
313 | * \ | \ | | |
314 | * V | V V | |
ea732dff | 315 | * |
cce94483 | 316 | * Closed <-> Closing |
ea732dff PD |
317 | * |
318 | * The state argument specifies the eventual state of the backend and the | |
319 | * function transitions to that state via the shortest path. | |
320 | */ | |
321 | static void set_backend_state(struct backend_info *be, | |
322 | enum xenbus_state state) | |
323 | { | |
324 | while (be->state != state) { | |
325 | switch (be->state) { | |
cce94483 FM |
326 | case XenbusStateInitialising: |
327 | switch (state) { | |
328 | case XenbusStateInitWait: | |
329 | case XenbusStateConnected: | |
330 | case XenbusStateClosing: | |
331 | backend_switch_state(be, XenbusStateInitWait); | |
332 | break; | |
333 | case XenbusStateClosed: | |
334 | backend_switch_state(be, XenbusStateClosed); | |
335 | break; | |
336 | default: | |
337 | BUG(); | |
338 | } | |
339 | break; | |
ea732dff PD |
340 | case XenbusStateClosed: |
341 | switch (state) { | |
342 | case XenbusStateInitWait: | |
343 | case XenbusStateConnected: | |
ea732dff PD |
344 | backend_switch_state(be, XenbusStateInitWait); |
345 | break; | |
346 | case XenbusStateClosing: | |
347 | backend_switch_state(be, XenbusStateClosing); | |
348 | break; | |
349 | default: | |
350 | BUG(); | |
351 | } | |
352 | break; | |
353 | case XenbusStateInitWait: | |
354 | switch (state) { | |
355 | case XenbusStateConnected: | |
356 | backend_connect(be); | |
357 | backend_switch_state(be, XenbusStateConnected); | |
358 | break; | |
359 | case XenbusStateClosing: | |
360 | case XenbusStateClosed: | |
361 | backend_switch_state(be, XenbusStateClosing); | |
362 | break; | |
363 | default: | |
364 | BUG(); | |
365 | } | |
366 | break; | |
367 | case XenbusStateConnected: | |
368 | switch (state) { | |
369 | case XenbusStateInitWait: | |
370 | case XenbusStateClosing: | |
371 | case XenbusStateClosed: | |
372 | backend_disconnect(be); | |
373 | backend_switch_state(be, XenbusStateClosing); | |
374 | break; | |
375 | default: | |
376 | BUG(); | |
377 | } | |
378 | break; | |
379 | case XenbusStateClosing: | |
380 | switch (state) { | |
381 | case XenbusStateInitWait: | |
382 | case XenbusStateConnected: | |
383 | case XenbusStateClosed: | |
384 | backend_switch_state(be, XenbusStateClosed); | |
385 | break; | |
386 | default: | |
387 | BUG(); | |
388 | } | |
389 | break; | |
390 | default: | |
391 | BUG(); | |
392 | } | |
f942dc25 IC |
393 | } |
394 | } | |
395 | ||
1c9535c7 DK |
396 | static void read_xenbus_frontend_xdp(struct backend_info *be, |
397 | struct xenbus_device *dev) | |
398 | { | |
399 | struct xenvif *vif = be->vif; | |
400 | u16 headroom; | |
401 | int err; | |
402 | ||
403 | err = xenbus_scanf(XBT_NIL, dev->otherend, | |
404 | "xdp-headroom", "%hu", &headroom); | |
405 | if (err != 1) { | |
406 | vif->xdp_headroom = 0; | |
407 | return; | |
408 | } | |
409 | if (headroom > XEN_NETIF_MAX_XDP_HEADROOM) | |
410 | headroom = XEN_NETIF_MAX_XDP_HEADROOM; | |
411 | vif->xdp_headroom = headroom; | |
412 | } | |
413 | ||
f942dc25 IC |
414 | /** |
415 | * Callback received when the frontend's state changes. | |
416 | */ | |
417 | static void frontend_changed(struct xenbus_device *dev, | |
418 | enum xenbus_state frontend_state) | |
419 | { | |
420 | struct backend_info *be = dev_get_drvdata(&dev->dev); | |
421 | ||
ea732dff | 422 | pr_debug("%s -> %s\n", dev->otherend, xenbus_strstate(frontend_state)); |
f942dc25 IC |
423 | |
424 | be->frontend_state = frontend_state; | |
425 | ||
426 | switch (frontend_state) { | |
427 | case XenbusStateInitialising: | |
ea732dff | 428 | set_backend_state(be, XenbusStateInitWait); |
f942dc25 IC |
429 | break; |
430 | ||
431 | case XenbusStateInitialised: | |
432 | break; | |
433 | ||
434 | case XenbusStateConnected: | |
ea732dff | 435 | set_backend_state(be, XenbusStateConnected); |
f942dc25 IC |
436 | break; |
437 | ||
1c9535c7 DK |
438 | case XenbusStateReconfiguring: |
439 | read_xenbus_frontend_xdp(be, dev); | |
440 | xenbus_switch_state(dev, XenbusStateReconfigured); | |
441 | break; | |
442 | ||
f942dc25 | 443 | case XenbusStateClosing: |
ea732dff | 444 | set_backend_state(be, XenbusStateClosing); |
f942dc25 IC |
445 | break; |
446 | ||
447 | case XenbusStateClosed: | |
ea732dff | 448 | set_backend_state(be, XenbusStateClosed); |
f942dc25 IC |
449 | if (xenbus_dev_is_online(dev)) |
450 | break; | |
df561f66 | 451 | fallthrough; /* if not online */ |
f942dc25 | 452 | case XenbusStateUnknown: |
ea732dff | 453 | set_backend_state(be, XenbusStateClosed); |
f942dc25 IC |
454 | device_unregister(&dev->dev); |
455 | break; | |
456 | ||
457 | default: | |
458 | xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend", | |
459 | frontend_state); | |
460 | break; | |
461 | } | |
462 | } | |
463 | ||
464 | ||
465 | static void xen_net_read_rate(struct xenbus_device *dev, | |
466 | unsigned long *bytes, unsigned long *usec) | |
467 | { | |
468 | char *s, *e; | |
469 | unsigned long b, u; | |
470 | char *ratestr; | |
471 | ||
472 | /* Default to unlimited bandwidth. */ | |
473 | *bytes = ~0UL; | |
474 | *usec = 0; | |
475 | ||
476 | ratestr = xenbus_read(XBT_NIL, dev->nodename, "rate", NULL); | |
477 | if (IS_ERR(ratestr)) | |
478 | return; | |
479 | ||
480 | s = ratestr; | |
481 | b = simple_strtoul(s, &e, 10); | |
482 | if ((s == e) || (*e != ',')) | |
483 | goto fail; | |
484 | ||
485 | s = e + 1; | |
486 | u = simple_strtoul(s, &e, 10); | |
487 | if ((s == e) || (*e != '\0')) | |
488 | goto fail; | |
489 | ||
490 | *bytes = b; | |
491 | *usec = u; | |
492 | ||
493 | kfree(ratestr); | |
494 | return; | |
495 | ||
496 | fail: | |
497 | pr_warn("Failed to parse network rate limit. Traffic unlimited.\n"); | |
498 | kfree(ratestr); | |
499 | } | |
500 | ||
501 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | |
502 | { | |
503 | char *s, *e, *macstr; | |
504 | int i; | |
505 | ||
506 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | |
507 | if (IS_ERR(macstr)) | |
508 | return PTR_ERR(macstr); | |
509 | ||
510 | for (i = 0; i < ETH_ALEN; i++) { | |
511 | mac[i] = simple_strtoul(s, &e, 16); | |
512 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | |
513 | kfree(macstr); | |
514 | return -ENOENT; | |
515 | } | |
516 | s = e+1; | |
517 | } | |
518 | ||
519 | kfree(macstr); | |
520 | return 0; | |
521 | } | |
522 | ||
edafc132 | 523 | static void xen_net_rate_changed(struct xenbus_watch *watch, |
5584ea25 | 524 | const char *path, const char *token) |
edafc132 PI |
525 | { |
526 | struct xenvif *vif = container_of(watch, struct xenvif, credit_watch); | |
527 | struct xenbus_device *dev = xenvif_to_xenbus_device(vif); | |
528 | unsigned long credit_bytes; | |
529 | unsigned long credit_usec; | |
530 | unsigned int queue_index; | |
531 | ||
532 | xen_net_read_rate(dev, &credit_bytes, &credit_usec); | |
533 | for (queue_index = 0; queue_index < vif->num_queues; queue_index++) { | |
534 | struct xenvif_queue *queue = &vif->queues[queue_index]; | |
535 | ||
536 | queue->credit_bytes = credit_bytes; | |
537 | queue->credit_usec = credit_usec; | |
538 | if (!mod_timer_pending(&queue->credit_timeout, jiffies) && | |
539 | queue->remaining_credit > queue->credit_bytes) { | |
540 | queue->remaining_credit = queue->credit_bytes; | |
541 | } | |
542 | } | |
543 | } | |
544 | ||
22fae97d PD |
545 | static int xen_register_credit_watch(struct xenbus_device *dev, |
546 | struct xenvif *vif) | |
edafc132 PI |
547 | { |
548 | int err = 0; | |
549 | char *node; | |
550 | unsigned maxlen = strlen(dev->nodename) + sizeof("/rate"); | |
551 | ||
12b322ac PI |
552 | if (vif->credit_watch.node) |
553 | return -EADDRINUSE; | |
554 | ||
edafc132 PI |
555 | node = kmalloc(maxlen, GFP_KERNEL); |
556 | if (!node) | |
557 | return -ENOMEM; | |
558 | snprintf(node, maxlen, "%s/rate", dev->nodename); | |
559 | vif->credit_watch.node = node; | |
fed1755b | 560 | vif->credit_watch.will_handle = NULL; |
edafc132 PI |
561 | vif->credit_watch.callback = xen_net_rate_changed; |
562 | err = register_xenbus_watch(&vif->credit_watch); | |
563 | if (err) { | |
564 | pr_err("Failed to set watcher %s\n", vif->credit_watch.node); | |
565 | kfree(node); | |
566 | vif->credit_watch.node = NULL; | |
fed1755b | 567 | vif->credit_watch.will_handle = NULL; |
edafc132 PI |
568 | vif->credit_watch.callback = NULL; |
569 | } | |
570 | return err; | |
571 | } | |
572 | ||
22fae97d | 573 | static void xen_unregister_credit_watch(struct xenvif *vif) |
edafc132 PI |
574 | { |
575 | if (vif->credit_watch.node) { | |
576 | unregister_xenbus_watch(&vif->credit_watch); | |
577 | kfree(vif->credit_watch.node); | |
578 | vif->credit_watch.node = NULL; | |
579 | } | |
580 | } | |
581 | ||
22fae97d | 582 | static void xen_mcast_ctrl_changed(struct xenbus_watch *watch, |
5584ea25 | 583 | const char *path, const char *token) |
22fae97d PD |
584 | { |
585 | struct xenvif *vif = container_of(watch, struct xenvif, | |
586 | mcast_ctrl_watch); | |
587 | struct xenbus_device *dev = xenvif_to_xenbus_device(vif); | |
22fae97d | 588 | |
f95842e7 JG |
589 | vif->multicast_control = !!xenbus_read_unsigned(dev->otherend, |
590 | "request-multicast-control", 0); | |
22fae97d PD |
591 | } |
592 | ||
593 | static int xen_register_mcast_ctrl_watch(struct xenbus_device *dev, | |
594 | struct xenvif *vif) | |
595 | { | |
596 | int err = 0; | |
597 | char *node; | |
598 | unsigned maxlen = strlen(dev->otherend) + | |
599 | sizeof("/request-multicast-control"); | |
600 | ||
601 | if (vif->mcast_ctrl_watch.node) { | |
602 | pr_err_ratelimited("Watch is already registered\n"); | |
603 | return -EADDRINUSE; | |
604 | } | |
605 | ||
606 | node = kmalloc(maxlen, GFP_KERNEL); | |
607 | if (!node) { | |
608 | pr_err("Failed to allocate memory for watch\n"); | |
609 | return -ENOMEM; | |
610 | } | |
611 | snprintf(node, maxlen, "%s/request-multicast-control", | |
612 | dev->otherend); | |
613 | vif->mcast_ctrl_watch.node = node; | |
fed1755b | 614 | vif->mcast_ctrl_watch.will_handle = NULL; |
22fae97d PD |
615 | vif->mcast_ctrl_watch.callback = xen_mcast_ctrl_changed; |
616 | err = register_xenbus_watch(&vif->mcast_ctrl_watch); | |
617 | if (err) { | |
618 | pr_err("Failed to set watcher %s\n", | |
619 | vif->mcast_ctrl_watch.node); | |
620 | kfree(node); | |
621 | vif->mcast_ctrl_watch.node = NULL; | |
fed1755b | 622 | vif->mcast_ctrl_watch.will_handle = NULL; |
22fae97d PD |
623 | vif->mcast_ctrl_watch.callback = NULL; |
624 | } | |
625 | return err; | |
626 | } | |
627 | ||
628 | static void xen_unregister_mcast_ctrl_watch(struct xenvif *vif) | |
629 | { | |
630 | if (vif->mcast_ctrl_watch.node) { | |
631 | unregister_xenbus_watch(&vif->mcast_ctrl_watch); | |
632 | kfree(vif->mcast_ctrl_watch.node); | |
633 | vif->mcast_ctrl_watch.node = NULL; | |
634 | } | |
635 | } | |
636 | ||
637 | static void xen_register_watchers(struct xenbus_device *dev, | |
638 | struct xenvif *vif) | |
639 | { | |
640 | xen_register_credit_watch(dev, vif); | |
641 | xen_register_mcast_ctrl_watch(dev, vif); | |
642 | } | |
643 | ||
644 | static void xen_unregister_watchers(struct xenvif *vif) | |
645 | { | |
646 | xen_unregister_mcast_ctrl_watch(vif); | |
647 | xen_unregister_credit_watch(vif); | |
648 | } | |
649 | ||
f942dc25 IC |
650 | static void unregister_hotplug_status_watch(struct backend_info *be) |
651 | { | |
652 | if (be->have_hotplug_status_watch) { | |
653 | unregister_xenbus_watch(&be->hotplug_status_watch); | |
654 | kfree(be->hotplug_status_watch.node); | |
655 | } | |
656 | be->have_hotplug_status_watch = 0; | |
657 | } | |
658 | ||
659 | static void hotplug_status_changed(struct xenbus_watch *watch, | |
5584ea25 JG |
660 | const char *path, |
661 | const char *token) | |
f942dc25 IC |
662 | { |
663 | struct backend_info *be = container_of(watch, | |
664 | struct backend_info, | |
665 | hotplug_status_watch); | |
666 | char *str; | |
667 | unsigned int len; | |
668 | ||
669 | str = xenbus_read(XBT_NIL, be->dev->nodename, "hotplug-status", &len); | |
670 | if (IS_ERR(str)) | |
671 | return; | |
672 | if (len == sizeof("connected")-1 && !memcmp(str, "connected", len)) { | |
ea732dff PD |
673 | /* Complete any pending state change */ |
674 | xenbus_switch_state(be->dev, be->state); | |
675 | ||
f942dc25 IC |
676 | /* Not interested in this watch anymore. */ |
677 | unregister_hotplug_status_watch(be); | |
1f256578 | 678 | xenbus_rm(XBT_NIL, be->dev->nodename, "hotplug-status"); |
f942dc25 IC |
679 | } |
680 | kfree(str); | |
681 | } | |
682 | ||
4e15ee2c PD |
683 | static int connect_ctrl_ring(struct backend_info *be) |
684 | { | |
685 | struct xenbus_device *dev = be->dev; | |
686 | struct xenvif *vif = be->vif; | |
687 | unsigned int val; | |
688 | grant_ref_t ring_ref; | |
689 | unsigned int evtchn; | |
690 | int err; | |
691 | ||
6c27f99d JB |
692 | err = xenbus_scanf(XBT_NIL, dev->otherend, |
693 | "ctrl-ring-ref", "%u", &val); | |
694 | if (err < 0) | |
4e15ee2c PD |
695 | goto done; /* The frontend does not have a control ring */ |
696 | ||
697 | ring_ref = val; | |
698 | ||
6c27f99d JB |
699 | err = xenbus_scanf(XBT_NIL, dev->otherend, |
700 | "event-channel-ctrl", "%u", &val); | |
701 | if (err < 0) { | |
4e15ee2c PD |
702 | xenbus_dev_fatal(dev, err, |
703 | "reading %s/event-channel-ctrl", | |
704 | dev->otherend); | |
705 | goto fail; | |
706 | } | |
707 | ||
708 | evtchn = val; | |
709 | ||
710 | err = xenvif_connect_ctrl(vif, ring_ref, evtchn); | |
711 | if (err) { | |
712 | xenbus_dev_fatal(dev, err, | |
713 | "mapping shared-frame %u port %u", | |
714 | ring_ref, evtchn); | |
715 | goto fail; | |
716 | } | |
717 | ||
718 | done: | |
719 | return 0; | |
720 | ||
721 | fail: | |
722 | return err; | |
723 | } | |
724 | ||
f942dc25 IC |
725 | static void connect(struct backend_info *be) |
726 | { | |
727 | int err; | |
728 | struct xenbus_device *dev = be->dev; | |
e9ce7cb6 WL |
729 | unsigned long credit_bytes, credit_usec; |
730 | unsigned int queue_index; | |
8d3d53b3 | 731 | unsigned int requested_num_queues; |
e9ce7cb6 | 732 | struct xenvif_queue *queue; |
f942dc25 | 733 | |
8d3d53b3 AB |
734 | /* Check whether the frontend requested multiple queues |
735 | * and read the number requested. | |
736 | */ | |
f95842e7 JG |
737 | requested_num_queues = xenbus_read_unsigned(dev->otherend, |
738 | "multi-queue-num-queues", 1); | |
739 | if (requested_num_queues > xenvif_max_queues) { | |
8d3d53b3 | 740 | /* buggy or malicious guest */ |
0f06ac3b | 741 | xenbus_dev_fatal(dev, -EINVAL, |
8d3d53b3 AB |
742 | "guest requested %u queues, exceeding the maximum of %u.", |
743 | requested_num_queues, xenvif_max_queues); | |
744 | return; | |
745 | } | |
746 | ||
f942dc25 IC |
747 | err = xen_net_read_mac(dev, be->vif->fe_dev_addr); |
748 | if (err) { | |
749 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | |
750 | return; | |
751 | } | |
752 | ||
e9ce7cb6 | 753 | xen_net_read_rate(dev, &credit_bytes, &credit_usec); |
12b322ac | 754 | xen_unregister_watchers(be->vif); |
edafc132 | 755 | xen_register_watchers(dev, be->vif); |
e9ce7cb6 WL |
756 | read_xenbus_vif_flags(be); |
757 | ||
4e15ee2c PD |
758 | err = connect_ctrl_ring(be); |
759 | if (err) { | |
760 | xenbus_dev_fatal(dev, err, "connecting control ring"); | |
761 | return; | |
762 | } | |
763 | ||
8d3d53b3 | 764 | /* Use the number of queues requested by the frontend */ |
fad953ce KC |
765 | be->vif->queues = vzalloc(array_size(requested_num_queues, |
766 | sizeof(struct xenvif_queue))); | |
833b8f18 IY |
767 | if (!be->vif->queues) { |
768 | xenbus_dev_fatal(dev, -ENOMEM, | |
769 | "allocating queues"); | |
770 | return; | |
771 | } | |
772 | ||
f7b50c4e | 773 | be->vif->num_queues = requested_num_queues; |
ecf08d2d | 774 | be->vif->stalled_queues = requested_num_queues; |
e9ce7cb6 WL |
775 | |
776 | for (queue_index = 0; queue_index < requested_num_queues; ++queue_index) { | |
777 | queue = &be->vif->queues[queue_index]; | |
778 | queue->vif = be->vif; | |
779 | queue->id = queue_index; | |
780 | snprintf(queue->name, sizeof(queue->name), "%s-q%u", | |
781 | be->vif->dev->name, queue->id); | |
782 | ||
783 | err = xenvif_init_queue(queue); | |
8d3d53b3 AB |
784 | if (err) { |
785 | /* xenvif_init_queue() cleans up after itself on | |
786 | * failure, but we need to clean up any previously | |
787 | * initialised queues. Set num_queues to i so that | |
788 | * earlier queues can be destroyed using the regular | |
789 | * disconnect logic. | |
790 | */ | |
f7b50c4e | 791 | be->vif->num_queues = queue_index; |
e9ce7cb6 | 792 | goto err; |
8d3d53b3 | 793 | } |
e9ce7cb6 | 794 | |
ce0e5c52 | 795 | queue->credit_bytes = credit_bytes; |
e9ce7cb6 | 796 | queue->remaining_credit = credit_bytes; |
07ff890d | 797 | queue->credit_usec = credit_usec; |
e9ce7cb6 | 798 | |
4e15ee2c | 799 | err = connect_data_rings(be, queue); |
8d3d53b3 | 800 | if (err) { |
4e15ee2c PD |
801 | /* connect_data_rings() cleans up after itself on |
802 | * failure, but we need to clean up after | |
803 | * xenvif_init_queue() here, and also clean up any | |
804 | * previously initialised queues. | |
8d3d53b3 AB |
805 | */ |
806 | xenvif_deinit_queue(queue); | |
f7b50c4e | 807 | be->vif->num_queues = queue_index; |
e9ce7cb6 | 808 | goto err; |
8d3d53b3 | 809 | } |
628fa76b WL |
810 | } |
811 | ||
f51de243 | 812 | #ifdef CONFIG_DEBUG_FS |
628fa76b | 813 | xenvif_debugfs_addif(be->vif); |
f51de243 | 814 | #endif /* CONFIG_DEBUG_FS */ |
e9ce7cb6 | 815 | |
f7b50c4e WL |
816 | /* Initialisation completed, tell core driver the number of |
817 | * active queues. | |
818 | */ | |
819 | rtnl_lock(); | |
820 | netif_set_real_num_tx_queues(be->vif->dev, requested_num_queues); | |
821 | netif_set_real_num_rx_queues(be->vif->dev, requested_num_queues); | |
822 | rtnl_unlock(); | |
823 | ||
e9ce7cb6 | 824 | xenvif_carrier_on(be->vif); |
f942dc25 IC |
825 | |
826 | unregister_hotplug_status_watch(be); | |
2e85d32b | 827 | err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch, NULL, |
f942dc25 IC |
828 | hotplug_status_changed, |
829 | "%s/%s", dev->nodename, "hotplug-status"); | |
ea732dff | 830 | if (!err) |
f942dc25 | 831 | be->have_hotplug_status_watch = 1; |
f942dc25 | 832 | |
e9ce7cb6 WL |
833 | netif_tx_wake_all_queues(be->vif->dev); |
834 | ||
835 | return; | |
836 | ||
837 | err: | |
f7b50c4e | 838 | if (be->vif->num_queues > 0) |
4e15ee2c | 839 | xenvif_disconnect_data(be->vif); /* Clean up existing queues */ |
9a6cdf52 ID |
840 | for (queue_index = 0; queue_index < be->vif->num_queues; ++queue_index) |
841 | xenvif_deinit_queue(&be->vif->queues[queue_index]); | |
e9ce7cb6 WL |
842 | vfree(be->vif->queues); |
843 | be->vif->queues = NULL; | |
f7b50c4e | 844 | be->vif->num_queues = 0; |
4e15ee2c | 845 | xenvif_disconnect_ctrl(be->vif); |
e9ce7cb6 | 846 | return; |
f942dc25 IC |
847 | } |
848 | ||
849 | ||
4e15ee2c PD |
850 | static int connect_data_rings(struct backend_info *be, |
851 | struct xenvif_queue *queue) | |
f942dc25 | 852 | { |
f942dc25 | 853 | struct xenbus_device *dev = be->dev; |
f7b50c4e | 854 | unsigned int num_queues = queue->vif->num_queues; |
f942dc25 | 855 | unsigned long tx_ring_ref, rx_ring_ref; |
e9ce7cb6 | 856 | unsigned int tx_evtchn, rx_evtchn; |
f942dc25 | 857 | int err; |
8d3d53b3 AB |
858 | char *xspath; |
859 | size_t xspathsize; | |
860 | const size_t xenstore_path_ext_size = 11; /* sufficient for "/queue-NNN" */ | |
861 | ||
862 | /* If the frontend requested 1 queue, or we have fallen back | |
863 | * to single queue due to lack of frontend support for multi- | |
864 | * queue, expect the remaining XenStore keys in the toplevel | |
865 | * directory. Otherwise, expect them in a subdirectory called | |
866 | * queue-N. | |
867 | */ | |
868 | if (num_queues == 1) { | |
869 | xspath = kzalloc(strlen(dev->otherend) + 1, GFP_KERNEL); | |
870 | if (!xspath) { | |
871 | xenbus_dev_fatal(dev, -ENOMEM, | |
872 | "reading ring references"); | |
873 | return -ENOMEM; | |
874 | } | |
875 | strcpy(xspath, dev->otherend); | |
876 | } else { | |
877 | xspathsize = strlen(dev->otherend) + xenstore_path_ext_size; | |
878 | xspath = kzalloc(xspathsize, GFP_KERNEL); | |
879 | if (!xspath) { | |
880 | xenbus_dev_fatal(dev, -ENOMEM, | |
881 | "reading ring references"); | |
882 | return -ENOMEM; | |
883 | } | |
884 | snprintf(xspath, xspathsize, "%s/queue-%u", dev->otherend, | |
885 | queue->id); | |
886 | } | |
f942dc25 | 887 | |
8d3d53b3 | 888 | err = xenbus_gather(XBT_NIL, xspath, |
f942dc25 | 889 | "tx-ring-ref", "%lu", &tx_ring_ref, |
e1f00a69 | 890 | "rx-ring-ref", "%lu", &rx_ring_ref, NULL); |
f942dc25 IC |
891 | if (err) { |
892 | xenbus_dev_fatal(dev, err, | |
e1f00a69 | 893 | "reading %s/ring-ref", |
8d3d53b3 AB |
894 | xspath); |
895 | goto err; | |
f942dc25 IC |
896 | } |
897 | ||
e1f00a69 | 898 | /* Try split event channels first, then single event channel. */ |
8d3d53b3 | 899 | err = xenbus_gather(XBT_NIL, xspath, |
e1f00a69 WL |
900 | "event-channel-tx", "%u", &tx_evtchn, |
901 | "event-channel-rx", "%u", &rx_evtchn, NULL); | |
902 | if (err < 0) { | |
8d3d53b3 | 903 | err = xenbus_scanf(XBT_NIL, xspath, |
e1f00a69 WL |
904 | "event-channel", "%u", &tx_evtchn); |
905 | if (err < 0) { | |
906 | xenbus_dev_fatal(dev, err, | |
907 | "reading %s/event-channel(-tx/rx)", | |
8d3d53b3 AB |
908 | xspath); |
909 | goto err; | |
e1f00a69 WL |
910 | } |
911 | rx_evtchn = tx_evtchn; | |
912 | } | |
913 | ||
e9ce7cb6 | 914 | /* Map the shared frame, irq etc. */ |
4e15ee2c PD |
915 | err = xenvif_connect_data(queue, tx_ring_ref, rx_ring_ref, |
916 | tx_evtchn, rx_evtchn); | |
e9ce7cb6 WL |
917 | if (err) { |
918 | xenbus_dev_fatal(dev, err, | |
919 | "mapping shared-frames %lu/%lu port tx %u rx %u", | |
920 | tx_ring_ref, rx_ring_ref, | |
921 | tx_evtchn, rx_evtchn); | |
8d3d53b3 | 922 | goto err; |
e9ce7cb6 WL |
923 | } |
924 | ||
8d3d53b3 AB |
925 | err = 0; |
926 | err: /* Regular return falls through with err == 0 */ | |
927 | kfree(xspath); | |
928 | return err; | |
e9ce7cb6 WL |
929 | } |
930 | ||
931 | static int read_xenbus_vif_flags(struct backend_info *be) | |
932 | { | |
933 | struct xenvif *vif = be->vif; | |
934 | struct xenbus_device *dev = be->dev; | |
935 | unsigned int rx_copy; | |
f95842e7 | 936 | int err; |
e9ce7cb6 | 937 | |
f942dc25 IC |
938 | err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u", |
939 | &rx_copy); | |
940 | if (err == -ENOENT) { | |
941 | err = 0; | |
942 | rx_copy = 0; | |
943 | } | |
944 | if (err < 0) { | |
945 | xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy", | |
946 | dev->otherend); | |
947 | return err; | |
948 | } | |
949 | if (!rx_copy) | |
950 | return -EOPNOTSUPP; | |
951 | ||
f95842e7 | 952 | if (!xenbus_read_unsigned(dev->otherend, "feature-rx-notify", 0)) { |
26c0e102 DV |
953 | /* - Reduce drain timeout to poll more frequently for |
954 | * Rx requests. | |
955 | * - Disable Rx stall detection. | |
956 | */ | |
957 | be->vif->drain_timeout = msecs_to_jiffies(30); | |
958 | be->vif->stall_timeout = 0; | |
f942dc25 IC |
959 | } |
960 | ||
f95842e7 | 961 | vif->can_sg = !!xenbus_read_unsigned(dev->otherend, "feature-sg", 0); |
f942dc25 | 962 | |
82cada22 | 963 | vif->gso_mask = 0; |
82cada22 | 964 | |
f95842e7 | 965 | if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv4", 0)) |
82cada22 | 966 | vif->gso_mask |= GSO_BIT(TCPV4); |
f942dc25 | 967 | |
f95842e7 | 968 | if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv6", 0)) |
82cada22 PD |
969 | vif->gso_mask |= GSO_BIT(TCPV6); |
970 | ||
f95842e7 JG |
971 | vif->ip_csum = !xenbus_read_unsigned(dev->otherend, |
972 | "feature-no-csum-offload", 0); | |
146c8a77 | 973 | |
f95842e7 JG |
974 | vif->ipv6_csum = !!xenbus_read_unsigned(dev->otherend, |
975 | "feature-ipv6-csum-offload", 0); | |
f942dc25 | 976 | |
1c9535c7 DK |
977 | read_xenbus_frontend_xdp(be, dev); |
978 | ||
f942dc25 IC |
979 | return 0; |
980 | } | |
981 | ||
92fbeb43 PD |
982 | static int netback_remove(struct xenbus_device *dev) |
983 | { | |
984 | struct backend_info *be = dev_get_drvdata(&dev->dev); | |
985 | ||
92fbeb43 PD |
986 | unregister_hotplug_status_watch(be); |
987 | if (be->vif) { | |
988 | kobject_uevent(&dev->dev.kobj, KOBJ_OFFLINE); | |
9476654b | 989 | backend_disconnect(be); |
92fbeb43 PD |
990 | xenvif_free(be->vif); |
991 | be->vif = NULL; | |
992 | } | |
993 | kfree(be->hotplug_script); | |
994 | kfree(be); | |
995 | dev_set_drvdata(&dev->dev, NULL); | |
996 | return 0; | |
997 | } | |
998 | ||
999 | /** | |
1000 | * Entry point to this code when a new device is created. Allocate the basic | |
1001 | * structures and switch to InitWait. | |
1002 | */ | |
1003 | static int netback_probe(struct xenbus_device *dev, | |
1004 | const struct xenbus_device_id *id) | |
1005 | { | |
1006 | const char *message; | |
1007 | struct xenbus_transaction xbt; | |
1008 | int err; | |
1009 | int sg; | |
1010 | const char *script; | |
1011 | struct backend_info *be = kzalloc(sizeof(*be), GFP_KERNEL); | |
1012 | ||
1013 | if (!be) { | |
1014 | xenbus_dev_fatal(dev, -ENOMEM, | |
1015 | "allocating backend structure"); | |
1016 | return -ENOMEM; | |
1017 | } | |
1018 | ||
1019 | be->dev = dev; | |
1020 | dev_set_drvdata(&dev->dev, be); | |
1021 | ||
92fbeb43 PD |
1022 | sg = 1; |
1023 | ||
1024 | do { | |
1025 | err = xenbus_transaction_start(&xbt); | |
1026 | if (err) { | |
1027 | xenbus_dev_fatal(dev, err, "starting transaction"); | |
1028 | goto fail; | |
1029 | } | |
1030 | ||
1031 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", sg); | |
1032 | if (err) { | |
1033 | message = "writing feature-sg"; | |
1034 | goto abort_transaction; | |
1035 | } | |
1036 | ||
1037 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", | |
1038 | "%d", sg); | |
1039 | if (err) { | |
1040 | message = "writing feature-gso-tcpv4"; | |
1041 | goto abort_transaction; | |
1042 | } | |
1043 | ||
1044 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv6", | |
1045 | "%d", sg); | |
1046 | if (err) { | |
1047 | message = "writing feature-gso-tcpv6"; | |
1048 | goto abort_transaction; | |
1049 | } | |
1050 | ||
1051 | /* We support partial checksum setup for IPv6 packets */ | |
1052 | err = xenbus_printf(xbt, dev->nodename, | |
1053 | "feature-ipv6-csum-offload", | |
1054 | "%d", 1); | |
1055 | if (err) { | |
1056 | message = "writing feature-ipv6-csum-offload"; | |
1057 | goto abort_transaction; | |
1058 | } | |
1059 | ||
1060 | /* We support rx-copy path. */ | |
1061 | err = xenbus_printf(xbt, dev->nodename, | |
1062 | "feature-rx-copy", "%d", 1); | |
1063 | if (err) { | |
1064 | message = "writing feature-rx-copy"; | |
1065 | goto abort_transaction; | |
1066 | } | |
1067 | ||
1c9535c7 DK |
1068 | /* we can adjust a headroom for netfront XDP processing */ |
1069 | err = xenbus_printf(xbt, dev->nodename, | |
1070 | "feature-xdp-headroom", "%d", | |
1071 | provides_xdp_headroom); | |
1072 | if (err) { | |
1073 | message = "writing feature-xdp-headroom"; | |
1074 | goto abort_transaction; | |
1075 | } | |
1076 | ||
92fbeb43 PD |
1077 | /* We don't support rx-flip path (except old guests who |
1078 | * don't grok this feature flag). | |
1079 | */ | |
1080 | err = xenbus_printf(xbt, dev->nodename, | |
1081 | "feature-rx-flip", "%d", 0); | |
1082 | if (err) { | |
1083 | message = "writing feature-rx-flip"; | |
1084 | goto abort_transaction; | |
1085 | } | |
1086 | ||
1087 | /* We support dynamic multicast-control. */ | |
1088 | err = xenbus_printf(xbt, dev->nodename, | |
1089 | "feature-multicast-control", "%d", 1); | |
1090 | if (err) { | |
1091 | message = "writing feature-multicast-control"; | |
1092 | goto abort_transaction; | |
1093 | } | |
1094 | ||
1095 | err = xenbus_printf(xbt, dev->nodename, | |
1096 | "feature-dynamic-multicast-control", | |
1097 | "%d", 1); | |
1098 | if (err) { | |
1099 | message = "writing feature-dynamic-multicast-control"; | |
1100 | goto abort_transaction; | |
1101 | } | |
1102 | ||
1103 | err = xenbus_transaction_end(xbt, 0); | |
1104 | } while (err == -EAGAIN); | |
1105 | ||
1106 | if (err) { | |
1107 | xenbus_dev_fatal(dev, err, "completing transaction"); | |
1108 | goto fail; | |
1109 | } | |
1110 | ||
1111 | /* Split event channels support, this is optional so it is not | |
1112 | * put inside the above loop. | |
1113 | */ | |
1114 | err = xenbus_printf(XBT_NIL, dev->nodename, | |
1115 | "feature-split-event-channels", | |
1116 | "%u", separate_tx_rx_irq); | |
1117 | if (err) | |
1118 | pr_debug("Error writing feature-split-event-channels\n"); | |
1119 | ||
1120 | /* Multi-queue support: This is an optional feature. */ | |
1121 | err = xenbus_printf(XBT_NIL, dev->nodename, | |
1122 | "multi-queue-max-queues", "%u", xenvif_max_queues); | |
1123 | if (err) | |
1124 | pr_debug("Error writing multi-queue-max-queues\n"); | |
1125 | ||
1126 | err = xenbus_printf(XBT_NIL, dev->nodename, | |
1127 | "feature-ctrl-ring", | |
1128 | "%u", true); | |
1129 | if (err) | |
1130 | pr_debug("Error writing feature-ctrl-ring\n"); | |
1131 | ||
f55c3188 PD |
1132 | backend_switch_state(be, XenbusStateInitWait); |
1133 | ||
92fbeb43 PD |
1134 | script = xenbus_read(XBT_NIL, dev->nodename, "script", NULL); |
1135 | if (IS_ERR(script)) { | |
1136 | err = PTR_ERR(script); | |
1137 | xenbus_dev_fatal(dev, err, "reading script"); | |
1138 | goto fail; | |
1139 | } | |
1140 | ||
1141 | be->hotplug_script = script; | |
1142 | ||
1143 | /* This kicks hotplug scripts, so do it immediately. */ | |
1144 | err = backend_create_xenvif(be); | |
1145 | if (err) | |
1146 | goto fail; | |
1147 | ||
1148 | return 0; | |
1149 | ||
1150 | abort_transaction: | |
1151 | xenbus_transaction_end(xbt, 1); | |
1152 | xenbus_dev_fatal(dev, err, "%s", message); | |
1153 | fail: | |
1154 | pr_debug("failed\n"); | |
1155 | netback_remove(dev); | |
1156 | return err; | |
1157 | } | |
1158 | ||
f942dc25 IC |
1159 | static const struct xenbus_device_id netback_ids[] = { |
1160 | { "vif" }, | |
1161 | { "" } | |
1162 | }; | |
1163 | ||
95afae48 DV |
1164 | static struct xenbus_driver netback_driver = { |
1165 | .ids = netback_ids, | |
f942dc25 IC |
1166 | .probe = netback_probe, |
1167 | .remove = netback_remove, | |
1168 | .uevent = netback_uevent, | |
1169 | .otherend_changed = frontend_changed, | |
9476654b | 1170 | .allow_rebind = true, |
95afae48 | 1171 | }; |
f942dc25 IC |
1172 | |
1173 | int xenvif_xenbus_init(void) | |
1174 | { | |
73db144b | 1175 | return xenbus_register_backend(&netback_driver); |
f942dc25 | 1176 | } |
b103f358 WL |
1177 | |
1178 | void xenvif_xenbus_fini(void) | |
1179 | { | |
1180 | return xenbus_unregister_driver(&netback_driver); | |
1181 | } |