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3a4d5c94 MT |
1 | /* Copyright (C) 2009 Red Hat, Inc. |
2 | * Author: Michael S. Tsirkin <mst@redhat.com> | |
3 | * | |
4 | * This work is licensed under the terms of the GNU GPL, version 2. | |
5 | * | |
6 | * virtio-net server in host kernel. | |
7 | */ | |
8 | ||
9 | #include <linux/compat.h> | |
10 | #include <linux/eventfd.h> | |
11 | #include <linux/vhost.h> | |
12 | #include <linux/virtio_net.h> | |
13 | #include <linux/mmu_context.h> | |
14 | #include <linux/miscdevice.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/mutex.h> | |
17 | #include <linux/workqueue.h> | |
18 | #include <linux/rcupdate.h> | |
19 | #include <linux/file.h> | |
20 | ||
21 | #include <linux/net.h> | |
22 | #include <linux/if_packet.h> | |
23 | #include <linux/if_arp.h> | |
24 | #include <linux/if_tun.h> | |
25 | ||
26 | #include <net/sock.h> | |
27 | ||
28 | #include "vhost.h" | |
29 | ||
30 | /* Max number of bytes transferred before requeueing the job. | |
31 | * Using this limit prevents one virtqueue from starving others. */ | |
32 | #define VHOST_NET_WEIGHT 0x80000 | |
33 | ||
34 | enum { | |
35 | VHOST_NET_VQ_RX = 0, | |
36 | VHOST_NET_VQ_TX = 1, | |
37 | VHOST_NET_VQ_MAX = 2, | |
38 | }; | |
39 | ||
40 | enum vhost_net_poll_state { | |
41 | VHOST_NET_POLL_DISABLED = 0, | |
42 | VHOST_NET_POLL_STARTED = 1, | |
43 | VHOST_NET_POLL_STOPPED = 2, | |
44 | }; | |
45 | ||
46 | struct vhost_net { | |
47 | struct vhost_dev dev; | |
48 | struct vhost_virtqueue vqs[VHOST_NET_VQ_MAX]; | |
49 | struct vhost_poll poll[VHOST_NET_VQ_MAX]; | |
50 | /* Tells us whether we are polling a socket for TX. | |
51 | * We only do this when socket buffer fills up. | |
52 | * Protected by tx vq lock. */ | |
53 | enum vhost_net_poll_state tx_poll_state; | |
54 | }; | |
55 | ||
56 | /* Pop first len bytes from iovec. Return number of segments used. */ | |
57 | static int move_iovec_hdr(struct iovec *from, struct iovec *to, | |
58 | size_t len, int iov_count) | |
59 | { | |
60 | int seg = 0; | |
61 | size_t size; | |
62 | while (len && seg < iov_count) { | |
63 | size = min(from->iov_len, len); | |
64 | to->iov_base = from->iov_base; | |
65 | to->iov_len = size; | |
66 | from->iov_len -= size; | |
67 | from->iov_base += size; | |
68 | len -= size; | |
69 | ++from; | |
70 | ++to; | |
71 | ++seg; | |
72 | } | |
73 | return seg; | |
74 | } | |
75 | ||
76 | /* Caller must have TX VQ lock */ | |
77 | static void tx_poll_stop(struct vhost_net *net) | |
78 | { | |
79 | if (likely(net->tx_poll_state != VHOST_NET_POLL_STARTED)) | |
80 | return; | |
81 | vhost_poll_stop(net->poll + VHOST_NET_VQ_TX); | |
82 | net->tx_poll_state = VHOST_NET_POLL_STOPPED; | |
83 | } | |
84 | ||
85 | /* Caller must have TX VQ lock */ | |
86 | static void tx_poll_start(struct vhost_net *net, struct socket *sock) | |
87 | { | |
88 | if (unlikely(net->tx_poll_state != VHOST_NET_POLL_STOPPED)) | |
89 | return; | |
90 | vhost_poll_start(net->poll + VHOST_NET_VQ_TX, sock->file); | |
91 | net->tx_poll_state = VHOST_NET_POLL_STARTED; | |
92 | } | |
93 | ||
94 | /* Expects to be always run from workqueue - which acts as | |
95 | * read-size critical section for our kind of RCU. */ | |
96 | static void handle_tx(struct vhost_net *net) | |
97 | { | |
98 | struct vhost_virtqueue *vq = &net->dev.vqs[VHOST_NET_VQ_TX]; | |
99 | unsigned head, out, in, s; | |
100 | struct msghdr msg = { | |
101 | .msg_name = NULL, | |
102 | .msg_namelen = 0, | |
103 | .msg_control = NULL, | |
104 | .msg_controllen = 0, | |
105 | .msg_iov = vq->iov, | |
106 | .msg_flags = MSG_DONTWAIT, | |
107 | }; | |
108 | size_t len, total_len = 0; | |
109 | int err, wmem; | |
110 | size_t hdr_size; | |
111 | struct socket *sock = rcu_dereference(vq->private_data); | |
112 | if (!sock) | |
113 | return; | |
114 | ||
115 | wmem = atomic_read(&sock->sk->sk_wmem_alloc); | |
116 | if (wmem >= sock->sk->sk_sndbuf) | |
117 | return; | |
118 | ||
119 | use_mm(net->dev.mm); | |
120 | mutex_lock(&vq->mutex); | |
121 | vhost_disable_notify(vq); | |
122 | ||
123 | if (wmem < sock->sk->sk_sndbuf * 2) | |
124 | tx_poll_stop(net); | |
125 | hdr_size = vq->hdr_size; | |
126 | ||
127 | for (;;) { | |
128 | head = vhost_get_vq_desc(&net->dev, vq, vq->iov, | |
129 | ARRAY_SIZE(vq->iov), | |
130 | &out, &in, | |
131 | NULL, NULL); | |
132 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
133 | if (head == vq->num) { | |
134 | wmem = atomic_read(&sock->sk->sk_wmem_alloc); | |
135 | if (wmem >= sock->sk->sk_sndbuf * 3 / 4) { | |
136 | tx_poll_start(net, sock); | |
137 | set_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
138 | break; | |
139 | } | |
140 | if (unlikely(vhost_enable_notify(vq))) { | |
141 | vhost_disable_notify(vq); | |
142 | continue; | |
143 | } | |
144 | break; | |
145 | } | |
146 | if (in) { | |
147 | vq_err(vq, "Unexpected descriptor format for TX: " | |
148 | "out %d, int %d\n", out, in); | |
149 | break; | |
150 | } | |
151 | /* Skip header. TODO: support TSO. */ | |
152 | s = move_iovec_hdr(vq->iov, vq->hdr, hdr_size, out); | |
153 | msg.msg_iovlen = out; | |
154 | len = iov_length(vq->iov, out); | |
155 | /* Sanity check */ | |
156 | if (!len) { | |
157 | vq_err(vq, "Unexpected header len for TX: " | |
158 | "%zd expected %zd\n", | |
159 | iov_length(vq->hdr, s), hdr_size); | |
160 | break; | |
161 | } | |
162 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ | |
163 | err = sock->ops->sendmsg(NULL, sock, &msg, len); | |
164 | if (unlikely(err < 0)) { | |
165 | vhost_discard_vq_desc(vq); | |
166 | tx_poll_start(net, sock); | |
167 | break; | |
168 | } | |
169 | if (err != len) | |
170 | pr_err("Truncated TX packet: " | |
171 | " len %d != %zd\n", err, len); | |
172 | vhost_add_used_and_signal(&net->dev, vq, head, 0); | |
173 | total_len += len; | |
174 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { | |
175 | vhost_poll_queue(&vq->poll); | |
176 | break; | |
177 | } | |
178 | } | |
179 | ||
180 | mutex_unlock(&vq->mutex); | |
181 | unuse_mm(net->dev.mm); | |
182 | } | |
183 | ||
184 | /* Expects to be always run from workqueue - which acts as | |
185 | * read-size critical section for our kind of RCU. */ | |
186 | static void handle_rx(struct vhost_net *net) | |
187 | { | |
188 | struct vhost_virtqueue *vq = &net->dev.vqs[VHOST_NET_VQ_RX]; | |
189 | unsigned head, out, in, log, s; | |
190 | struct vhost_log *vq_log; | |
191 | struct msghdr msg = { | |
192 | .msg_name = NULL, | |
193 | .msg_namelen = 0, | |
194 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ | |
195 | .msg_controllen = 0, | |
196 | .msg_iov = vq->iov, | |
197 | .msg_flags = MSG_DONTWAIT, | |
198 | }; | |
199 | ||
200 | struct virtio_net_hdr hdr = { | |
201 | .flags = 0, | |
202 | .gso_type = VIRTIO_NET_HDR_GSO_NONE | |
203 | }; | |
204 | ||
205 | size_t len, total_len = 0; | |
206 | int err; | |
207 | size_t hdr_size; | |
208 | struct socket *sock = rcu_dereference(vq->private_data); | |
209 | if (!sock || skb_queue_empty(&sock->sk->sk_receive_queue)) | |
210 | return; | |
211 | ||
212 | use_mm(net->dev.mm); | |
213 | mutex_lock(&vq->mutex); | |
214 | vhost_disable_notify(vq); | |
215 | hdr_size = vq->hdr_size; | |
216 | ||
217 | vq_log = unlikely(vhost_has_feature(&net->dev, VHOST_F_LOG_ALL)) ? | |
218 | vq->log : NULL; | |
219 | ||
220 | for (;;) { | |
221 | head = vhost_get_vq_desc(&net->dev, vq, vq->iov, | |
222 | ARRAY_SIZE(vq->iov), | |
223 | &out, &in, | |
224 | vq_log, &log); | |
225 | /* OK, now we need to know about added descriptors. */ | |
226 | if (head == vq->num) { | |
227 | if (unlikely(vhost_enable_notify(vq))) { | |
228 | /* They have slipped one in as we were | |
229 | * doing that: check again. */ | |
230 | vhost_disable_notify(vq); | |
231 | continue; | |
232 | } | |
233 | /* Nothing new? Wait for eventfd to tell us | |
234 | * they refilled. */ | |
235 | break; | |
236 | } | |
237 | /* We don't need to be notified again. */ | |
238 | if (out) { | |
239 | vq_err(vq, "Unexpected descriptor format for RX: " | |
240 | "out %d, int %d\n", | |
241 | out, in); | |
242 | break; | |
243 | } | |
244 | /* Skip header. TODO: support TSO/mergeable rx buffers. */ | |
245 | s = move_iovec_hdr(vq->iov, vq->hdr, hdr_size, in); | |
246 | msg.msg_iovlen = in; | |
247 | len = iov_length(vq->iov, in); | |
248 | /* Sanity check */ | |
249 | if (!len) { | |
250 | vq_err(vq, "Unexpected header len for RX: " | |
251 | "%zd expected %zd\n", | |
252 | iov_length(vq->hdr, s), hdr_size); | |
253 | break; | |
254 | } | |
255 | err = sock->ops->recvmsg(NULL, sock, &msg, | |
256 | len, MSG_DONTWAIT | MSG_TRUNC); | |
257 | /* TODO: Check specific error and bomb out unless EAGAIN? */ | |
258 | if (err < 0) { | |
259 | vhost_discard_vq_desc(vq); | |
260 | break; | |
261 | } | |
262 | /* TODO: Should check and handle checksum. */ | |
263 | if (err > len) { | |
264 | pr_err("Discarded truncated rx packet: " | |
265 | " len %d > %zd\n", err, len); | |
266 | vhost_discard_vq_desc(vq); | |
267 | continue; | |
268 | } | |
269 | len = err; | |
270 | err = memcpy_toiovec(vq->hdr, (unsigned char *)&hdr, hdr_size); | |
271 | if (err) { | |
272 | vq_err(vq, "Unable to write vnet_hdr at addr %p: %d\n", | |
273 | vq->iov->iov_base, err); | |
274 | break; | |
275 | } | |
276 | len += hdr_size; | |
277 | vhost_add_used_and_signal(&net->dev, vq, head, len); | |
278 | if (unlikely(vq_log)) | |
279 | vhost_log_write(vq, vq_log, log, len); | |
280 | total_len += len; | |
281 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { | |
282 | vhost_poll_queue(&vq->poll); | |
283 | break; | |
284 | } | |
285 | } | |
286 | ||
287 | mutex_unlock(&vq->mutex); | |
288 | unuse_mm(net->dev.mm); | |
289 | } | |
290 | ||
291 | static void handle_tx_kick(struct work_struct *work) | |
292 | { | |
293 | struct vhost_virtqueue *vq; | |
294 | struct vhost_net *net; | |
295 | vq = container_of(work, struct vhost_virtqueue, poll.work); | |
296 | net = container_of(vq->dev, struct vhost_net, dev); | |
297 | handle_tx(net); | |
298 | } | |
299 | ||
300 | static void handle_rx_kick(struct work_struct *work) | |
301 | { | |
302 | struct vhost_virtqueue *vq; | |
303 | struct vhost_net *net; | |
304 | vq = container_of(work, struct vhost_virtqueue, poll.work); | |
305 | net = container_of(vq->dev, struct vhost_net, dev); | |
306 | handle_rx(net); | |
307 | } | |
308 | ||
309 | static void handle_tx_net(struct work_struct *work) | |
310 | { | |
311 | struct vhost_net *net; | |
312 | net = container_of(work, struct vhost_net, poll[VHOST_NET_VQ_TX].work); | |
313 | handle_tx(net); | |
314 | } | |
315 | ||
316 | static void handle_rx_net(struct work_struct *work) | |
317 | { | |
318 | struct vhost_net *net; | |
319 | net = container_of(work, struct vhost_net, poll[VHOST_NET_VQ_RX].work); | |
320 | handle_rx(net); | |
321 | } | |
322 | ||
323 | static int vhost_net_open(struct inode *inode, struct file *f) | |
324 | { | |
325 | struct vhost_net *n = kmalloc(sizeof *n, GFP_KERNEL); | |
326 | int r; | |
327 | if (!n) | |
328 | return -ENOMEM; | |
329 | n->vqs[VHOST_NET_VQ_TX].handle_kick = handle_tx_kick; | |
330 | n->vqs[VHOST_NET_VQ_RX].handle_kick = handle_rx_kick; | |
331 | r = vhost_dev_init(&n->dev, n->vqs, VHOST_NET_VQ_MAX); | |
332 | if (r < 0) { | |
333 | kfree(n); | |
334 | return r; | |
335 | } | |
336 | ||
337 | vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, POLLOUT); | |
338 | vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, POLLIN); | |
339 | n->tx_poll_state = VHOST_NET_POLL_DISABLED; | |
340 | ||
341 | f->private_data = n; | |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
346 | static void vhost_net_disable_vq(struct vhost_net *n, | |
347 | struct vhost_virtqueue *vq) | |
348 | { | |
349 | if (!vq->private_data) | |
350 | return; | |
351 | if (vq == n->vqs + VHOST_NET_VQ_TX) { | |
352 | tx_poll_stop(n); | |
353 | n->tx_poll_state = VHOST_NET_POLL_DISABLED; | |
354 | } else | |
355 | vhost_poll_stop(n->poll + VHOST_NET_VQ_RX); | |
356 | } | |
357 | ||
358 | static void vhost_net_enable_vq(struct vhost_net *n, | |
359 | struct vhost_virtqueue *vq) | |
360 | { | |
361 | struct socket *sock = vq->private_data; | |
362 | if (!sock) | |
363 | return; | |
364 | if (vq == n->vqs + VHOST_NET_VQ_TX) { | |
365 | n->tx_poll_state = VHOST_NET_POLL_STOPPED; | |
366 | tx_poll_start(n, sock); | |
367 | } else | |
368 | vhost_poll_start(n->poll + VHOST_NET_VQ_RX, sock->file); | |
369 | } | |
370 | ||
371 | static struct socket *vhost_net_stop_vq(struct vhost_net *n, | |
372 | struct vhost_virtqueue *vq) | |
373 | { | |
374 | struct socket *sock; | |
375 | ||
376 | mutex_lock(&vq->mutex); | |
377 | sock = vq->private_data; | |
378 | vhost_net_disable_vq(n, vq); | |
379 | rcu_assign_pointer(vq->private_data, NULL); | |
380 | mutex_unlock(&vq->mutex); | |
381 | return sock; | |
382 | } | |
383 | ||
384 | static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, | |
385 | struct socket **rx_sock) | |
386 | { | |
387 | *tx_sock = vhost_net_stop_vq(n, n->vqs + VHOST_NET_VQ_TX); | |
388 | *rx_sock = vhost_net_stop_vq(n, n->vqs + VHOST_NET_VQ_RX); | |
389 | } | |
390 | ||
391 | static void vhost_net_flush_vq(struct vhost_net *n, int index) | |
392 | { | |
393 | vhost_poll_flush(n->poll + index); | |
394 | vhost_poll_flush(&n->dev.vqs[index].poll); | |
395 | } | |
396 | ||
397 | static void vhost_net_flush(struct vhost_net *n) | |
398 | { | |
399 | vhost_net_flush_vq(n, VHOST_NET_VQ_TX); | |
400 | vhost_net_flush_vq(n, VHOST_NET_VQ_RX); | |
401 | } | |
402 | ||
403 | static int vhost_net_release(struct inode *inode, struct file *f) | |
404 | { | |
405 | struct vhost_net *n = f->private_data; | |
406 | struct socket *tx_sock; | |
407 | struct socket *rx_sock; | |
408 | ||
409 | vhost_net_stop(n, &tx_sock, &rx_sock); | |
410 | vhost_net_flush(n); | |
411 | vhost_dev_cleanup(&n->dev); | |
412 | if (tx_sock) | |
413 | fput(tx_sock->file); | |
414 | if (rx_sock) | |
415 | fput(rx_sock->file); | |
416 | /* We do an extra flush before freeing memory, | |
417 | * since jobs can re-queue themselves. */ | |
418 | vhost_net_flush(n); | |
419 | kfree(n); | |
420 | return 0; | |
421 | } | |
422 | ||
423 | static struct socket *get_raw_socket(int fd) | |
424 | { | |
425 | struct { | |
426 | struct sockaddr_ll sa; | |
427 | char buf[MAX_ADDR_LEN]; | |
428 | } uaddr; | |
429 | int uaddr_len = sizeof uaddr, r; | |
430 | struct socket *sock = sockfd_lookup(fd, &r); | |
431 | if (!sock) | |
432 | return ERR_PTR(-ENOTSOCK); | |
433 | ||
434 | /* Parameter checking */ | |
435 | if (sock->sk->sk_type != SOCK_RAW) { | |
436 | r = -ESOCKTNOSUPPORT; | |
437 | goto err; | |
438 | } | |
439 | ||
440 | r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, | |
441 | &uaddr_len, 0); | |
442 | if (r) | |
443 | goto err; | |
444 | ||
445 | if (uaddr.sa.sll_family != AF_PACKET) { | |
446 | r = -EPFNOSUPPORT; | |
447 | goto err; | |
448 | } | |
449 | return sock; | |
450 | err: | |
451 | fput(sock->file); | |
452 | return ERR_PTR(r); | |
453 | } | |
454 | ||
455 | static struct socket *get_tun_socket(int fd) | |
456 | { | |
457 | struct file *file = fget(fd); | |
458 | struct socket *sock; | |
459 | if (!file) | |
460 | return ERR_PTR(-EBADF); | |
461 | sock = tun_get_socket(file); | |
462 | if (IS_ERR(sock)) | |
463 | fput(file); | |
464 | return sock; | |
465 | } | |
466 | ||
467 | static struct socket *get_socket(int fd) | |
468 | { | |
469 | struct socket *sock; | |
470 | /* special case to disable backend */ | |
471 | if (fd == -1) | |
472 | return NULL; | |
473 | sock = get_raw_socket(fd); | |
474 | if (!IS_ERR(sock)) | |
475 | return sock; | |
476 | sock = get_tun_socket(fd); | |
477 | if (!IS_ERR(sock)) | |
478 | return sock; | |
479 | return ERR_PTR(-ENOTSOCK); | |
480 | } | |
481 | ||
482 | static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) | |
483 | { | |
484 | struct socket *sock, *oldsock; | |
485 | struct vhost_virtqueue *vq; | |
486 | int r; | |
487 | ||
488 | mutex_lock(&n->dev.mutex); | |
489 | r = vhost_dev_check_owner(&n->dev); | |
490 | if (r) | |
491 | goto err; | |
492 | ||
493 | if (index >= VHOST_NET_VQ_MAX) { | |
494 | r = -ENOBUFS; | |
495 | goto err; | |
496 | } | |
497 | vq = n->vqs + index; | |
498 | mutex_lock(&vq->mutex); | |
499 | ||
500 | /* Verify that ring has been setup correctly. */ | |
501 | if (!vhost_vq_access_ok(vq)) { | |
502 | r = -EFAULT; | |
503 | goto err; | |
504 | } | |
505 | sock = get_socket(fd); | |
506 | if (IS_ERR(sock)) { | |
507 | r = PTR_ERR(sock); | |
508 | goto err; | |
509 | } | |
510 | ||
511 | /* start polling new socket */ | |
512 | oldsock = vq->private_data; | |
513 | if (sock == oldsock) | |
514 | goto done; | |
515 | ||
516 | vhost_net_disable_vq(n, vq); | |
517 | rcu_assign_pointer(vq->private_data, sock); | |
518 | vhost_net_enable_vq(n, vq); | |
519 | mutex_unlock(&vq->mutex); | |
520 | done: | |
521 | if (oldsock) { | |
522 | vhost_net_flush_vq(n, index); | |
523 | fput(oldsock->file); | |
524 | } | |
525 | err: | |
526 | mutex_unlock(&n->dev.mutex); | |
527 | return r; | |
528 | } | |
529 | ||
530 | static long vhost_net_reset_owner(struct vhost_net *n) | |
531 | { | |
532 | struct socket *tx_sock = NULL; | |
533 | struct socket *rx_sock = NULL; | |
534 | long err; | |
535 | mutex_lock(&n->dev.mutex); | |
536 | err = vhost_dev_check_owner(&n->dev); | |
537 | if (err) | |
538 | goto done; | |
539 | vhost_net_stop(n, &tx_sock, &rx_sock); | |
540 | vhost_net_flush(n); | |
541 | err = vhost_dev_reset_owner(&n->dev); | |
542 | done: | |
543 | mutex_unlock(&n->dev.mutex); | |
544 | if (tx_sock) | |
545 | fput(tx_sock->file); | |
546 | if (rx_sock) | |
547 | fput(rx_sock->file); | |
548 | return err; | |
549 | } | |
550 | ||
551 | static int vhost_net_set_features(struct vhost_net *n, u64 features) | |
552 | { | |
553 | size_t hdr_size = features & (1 << VHOST_NET_F_VIRTIO_NET_HDR) ? | |
554 | sizeof(struct virtio_net_hdr) : 0; | |
555 | int i; | |
556 | mutex_lock(&n->dev.mutex); | |
557 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
558 | !vhost_log_access_ok(&n->dev)) { | |
559 | mutex_unlock(&n->dev.mutex); | |
560 | return -EFAULT; | |
561 | } | |
562 | n->dev.acked_features = features; | |
563 | smp_wmb(); | |
564 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { | |
565 | mutex_lock(&n->vqs[i].mutex); | |
566 | n->vqs[i].hdr_size = hdr_size; | |
567 | mutex_unlock(&n->vqs[i].mutex); | |
568 | } | |
569 | vhost_net_flush(n); | |
570 | mutex_unlock(&n->dev.mutex); | |
571 | return 0; | |
572 | } | |
573 | ||
574 | static long vhost_net_ioctl(struct file *f, unsigned int ioctl, | |
575 | unsigned long arg) | |
576 | { | |
577 | struct vhost_net *n = f->private_data; | |
578 | void __user *argp = (void __user *)arg; | |
579 | u64 __user *featurep = argp; | |
580 | struct vhost_vring_file backend; | |
581 | u64 features; | |
582 | int r; | |
583 | switch (ioctl) { | |
584 | case VHOST_NET_SET_BACKEND: | |
585 | r = copy_from_user(&backend, argp, sizeof backend); | |
586 | if (r < 0) | |
587 | return r; | |
588 | return vhost_net_set_backend(n, backend.index, backend.fd); | |
589 | case VHOST_GET_FEATURES: | |
590 | features = VHOST_FEATURES; | |
591 | return copy_to_user(featurep, &features, sizeof features); | |
592 | case VHOST_SET_FEATURES: | |
593 | r = copy_from_user(&features, featurep, sizeof features); | |
594 | if (r < 0) | |
595 | return r; | |
596 | if (features & ~VHOST_FEATURES) | |
597 | return -EOPNOTSUPP; | |
598 | return vhost_net_set_features(n, features); | |
599 | case VHOST_RESET_OWNER: | |
600 | return vhost_net_reset_owner(n); | |
601 | default: | |
602 | mutex_lock(&n->dev.mutex); | |
603 | r = vhost_dev_ioctl(&n->dev, ioctl, arg); | |
604 | vhost_net_flush(n); | |
605 | mutex_unlock(&n->dev.mutex); | |
606 | return r; | |
607 | } | |
608 | } | |
609 | ||
610 | #ifdef CONFIG_COMPAT | |
611 | static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl, | |
612 | unsigned long arg) | |
613 | { | |
614 | return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
615 | } | |
616 | #endif | |
617 | ||
618 | const static struct file_operations vhost_net_fops = { | |
619 | .owner = THIS_MODULE, | |
620 | .release = vhost_net_release, | |
621 | .unlocked_ioctl = vhost_net_ioctl, | |
622 | #ifdef CONFIG_COMPAT | |
623 | .compat_ioctl = vhost_net_compat_ioctl, | |
624 | #endif | |
625 | .open = vhost_net_open, | |
626 | }; | |
627 | ||
628 | static struct miscdevice vhost_net_misc = { | |
629 | VHOST_NET_MINOR, | |
630 | "vhost-net", | |
631 | &vhost_net_fops, | |
632 | }; | |
633 | ||
634 | int vhost_net_init(void) | |
635 | { | |
636 | int r = vhost_init(); | |
637 | if (r) | |
638 | goto err_init; | |
639 | r = misc_register(&vhost_net_misc); | |
640 | if (r) | |
641 | goto err_reg; | |
642 | return 0; | |
643 | err_reg: | |
644 | vhost_cleanup(); | |
645 | err_init: | |
646 | return r; | |
647 | ||
648 | } | |
649 | module_init(vhost_net_init); | |
650 | ||
651 | void vhost_net_exit(void) | |
652 | { | |
653 | misc_deregister(&vhost_net_misc); | |
654 | vhost_cleanup(); | |
655 | } | |
656 | module_exit(vhost_net_exit); | |
657 | ||
658 | MODULE_VERSION("0.0.1"); | |
659 | MODULE_LICENSE("GPL v2"); | |
660 | MODULE_AUTHOR("Michael S. Tsirkin"); | |
661 | MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); |