1 /* Copyright (C) 2009 Red Hat, Inc.
2 * Author: Michael S. Tsirkin <mst@redhat.com>
4 * This work is licensed under the terms of the GNU GPL, version 2.
6 * virtio-net server in host kernel.
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 #include <linux/slab.h>
22 #include <linux/net.h>
23 #include <linux/if_packet.h>
24 #include <linux/if_arp.h>
25 #include <linux/if_tun.h>
26 #include <linux/if_macvlan.h>
32 /* Max number of bytes transferred before requeueing the job.
33 * Using this limit prevents one virtqueue from starving others. */
34 #define VHOST_NET_WEIGHT 0x80000
42 enum vhost_net_poll_state
{
43 VHOST_NET_POLL_DISABLED
= 0,
44 VHOST_NET_POLL_STARTED
= 1,
45 VHOST_NET_POLL_STOPPED
= 2,
50 struct vhost_virtqueue vqs
[VHOST_NET_VQ_MAX
];
51 struct vhost_poll poll
[VHOST_NET_VQ_MAX
];
52 /* Tells us whether we are polling a socket for TX.
53 * We only do this when socket buffer fills up.
54 * Protected by tx vq lock. */
55 enum vhost_net_poll_state tx_poll_state
;
58 /* Pop first len bytes from iovec. Return number of segments used. */
59 static int move_iovec_hdr(struct iovec
*from
, struct iovec
*to
,
60 size_t len
, int iov_count
)
64 while (len
&& seg
< iov_count
) {
65 size
= min(from
->iov_len
, len
);
66 to
->iov_base
= from
->iov_base
;
68 from
->iov_len
-= size
;
69 from
->iov_base
+= size
;
77 /* Copy iovec entries for len bytes from iovec. */
78 static void copy_iovec_hdr(const struct iovec
*from
, struct iovec
*to
,
79 size_t len
, int iovcount
)
83 while (len
&& seg
< iovcount
) {
84 size
= min(from
->iov_len
, len
);
85 to
->iov_base
= from
->iov_base
;
94 /* Caller must have TX VQ lock */
95 static void tx_poll_stop(struct vhost_net
*net
)
97 if (likely(net
->tx_poll_state
!= VHOST_NET_POLL_STARTED
))
99 vhost_poll_stop(net
->poll
+ VHOST_NET_VQ_TX
);
100 net
->tx_poll_state
= VHOST_NET_POLL_STOPPED
;
103 /* Caller must have TX VQ lock */
104 static void tx_poll_start(struct vhost_net
*net
, struct socket
*sock
)
106 if (unlikely(net
->tx_poll_state
!= VHOST_NET_POLL_STOPPED
))
108 vhost_poll_start(net
->poll
+ VHOST_NET_VQ_TX
, sock
->file
);
109 net
->tx_poll_state
= VHOST_NET_POLL_STARTED
;
112 /* Expects to be always run from workqueue - which acts as
113 * read-size critical section for our kind of RCU. */
114 static void handle_tx(struct vhost_net
*net
)
116 struct vhost_virtqueue
*vq
= &net
->dev
.vqs
[VHOST_NET_VQ_TX
];
119 struct msghdr msg
= {
125 .msg_flags
= MSG_DONTWAIT
,
127 size_t len
, total_len
= 0;
132 /* TODO: check that we are running from vhost_worker?
133 * Not sure it's worth it, it's straight-forward enough. */
134 sock
= rcu_dereference_check(vq
->private_data
, 1);
138 wmem
= atomic_read(&sock
->sk
->sk_wmem_alloc
);
139 if (wmem
>= sock
->sk
->sk_sndbuf
) {
140 mutex_lock(&vq
->mutex
);
141 tx_poll_start(net
, sock
);
142 mutex_unlock(&vq
->mutex
);
147 mutex_lock(&vq
->mutex
);
148 vhost_disable_notify(vq
);
150 if (wmem
< sock
->sk
->sk_sndbuf
/ 2)
152 hdr_size
= vq
->vhost_hlen
;
155 head
= vhost_get_vq_desc(&net
->dev
, vq
, vq
->iov
,
159 /* On error, stop handling until the next kick. */
160 if (unlikely(head
< 0))
162 /* Nothing new? Wait for eventfd to tell us they refilled. */
163 if (head
== vq
->num
) {
164 wmem
= atomic_read(&sock
->sk
->sk_wmem_alloc
);
165 if (wmem
>= sock
->sk
->sk_sndbuf
* 3 / 4) {
166 tx_poll_start(net
, sock
);
167 set_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
);
170 if (unlikely(vhost_enable_notify(vq
))) {
171 vhost_disable_notify(vq
);
177 vq_err(vq
, "Unexpected descriptor format for TX: "
178 "out %d, int %d\n", out
, in
);
181 /* Skip header. TODO: support TSO. */
182 s
= move_iovec_hdr(vq
->iov
, vq
->hdr
, hdr_size
, out
);
183 msg
.msg_iovlen
= out
;
184 len
= iov_length(vq
->iov
, out
);
187 vq_err(vq
, "Unexpected header len for TX: "
188 "%zd expected %zd\n",
189 iov_length(vq
->hdr
, s
), hdr_size
);
192 /* TODO: Check specific error and bomb out unless ENOBUFS? */
193 err
= sock
->ops
->sendmsg(NULL
, sock
, &msg
, len
);
194 if (unlikely(err
< 0)) {
195 vhost_discard_vq_desc(vq
, 1);
196 tx_poll_start(net
, sock
);
200 pr_debug("Truncated TX packet: "
201 " len %d != %zd\n", err
, len
);
202 vhost_add_used_and_signal(&net
->dev
, vq
, head
, 0);
204 if (unlikely(total_len
>= VHOST_NET_WEIGHT
)) {
205 vhost_poll_queue(&vq
->poll
);
210 mutex_unlock(&vq
->mutex
);
211 unuse_mm(net
->dev
.mm
);
214 static int peek_head_len(struct sock
*sk
)
216 struct sk_buff
*head
;
220 head
= skb_peek(&sk
->sk_receive_queue
);
227 /* This is a multi-buffer version of vhost_get_desc, that works if
228 * vq has read descriptors only.
229 * @vq - the relevant virtqueue
230 * @datalen - data length we'll be reading
231 * @iovcount - returned count of io vectors we fill
233 * @log_num - log offset
234 * returns number of buffer heads allocated, negative on error
236 static int get_rx_bufs(struct vhost_virtqueue
*vq
,
237 struct vring_used_elem
*heads
,
240 struct vhost_log
*log
,
243 unsigned int out
, in
;
249 while (datalen
> 0) {
250 if (unlikely(seg
>= UIO_MAXIOV
)) {
254 d
= vhost_get_vq_desc(vq
->dev
, vq
, vq
->iov
+ seg
,
255 ARRAY_SIZE(vq
->iov
) - seg
, &out
,
261 if (unlikely(out
|| in
<= 0)) {
262 vq_err(vq
, "unexpected descriptor format for RX: "
263 "out %d, in %d\n", out
, in
);
271 heads
[headcount
].id
= d
;
272 heads
[headcount
].len
= iov_length(vq
->iov
+ seg
, in
);
273 datalen
-= heads
[headcount
].len
;
277 heads
[headcount
- 1].len
+= datalen
;
283 vhost_discard_vq_desc(vq
, headcount
);
287 /* Expects to be always run from workqueue - which acts as
288 * read-size critical section for our kind of RCU. */
289 static void handle_rx_big(struct vhost_net
*net
)
291 struct vhost_virtqueue
*vq
= &net
->dev
.vqs
[VHOST_NET_VQ_RX
];
292 unsigned out
, in
, log
, s
;
294 struct vhost_log
*vq_log
;
295 struct msghdr msg
= {
298 .msg_control
= NULL
, /* FIXME: get and handle RX aux data. */
301 .msg_flags
= MSG_DONTWAIT
,
304 struct virtio_net_hdr hdr
= {
306 .gso_type
= VIRTIO_NET_HDR_GSO_NONE
309 size_t len
, total_len
= 0;
312 struct socket
*sock
= rcu_dereference(vq
->private_data
);
313 if (!sock
|| skb_queue_empty(&sock
->sk
->sk_receive_queue
))
317 mutex_lock(&vq
->mutex
);
318 vhost_disable_notify(vq
);
319 hdr_size
= vq
->vhost_hlen
;
321 vq_log
= unlikely(vhost_has_feature(&net
->dev
, VHOST_F_LOG_ALL
)) ?
325 head
= vhost_get_vq_desc(&net
->dev
, vq
, vq
->iov
,
329 /* On error, stop handling until the next kick. */
330 if (unlikely(head
< 0))
332 /* OK, now we need to know about added descriptors. */
333 if (head
== vq
->num
) {
334 if (unlikely(vhost_enable_notify(vq
))) {
335 /* They have slipped one in as we were
336 * doing that: check again. */
337 vhost_disable_notify(vq
);
340 /* Nothing new? Wait for eventfd to tell us
344 /* We don't need to be notified again. */
346 vq_err(vq
, "Unexpected descriptor format for RX: "
351 /* Skip header. TODO: support TSO/mergeable rx buffers. */
352 s
= move_iovec_hdr(vq
->iov
, vq
->hdr
, hdr_size
, in
);
354 len
= iov_length(vq
->iov
, in
);
357 vq_err(vq
, "Unexpected header len for RX: "
358 "%zd expected %zd\n",
359 iov_length(vq
->hdr
, s
), hdr_size
);
362 err
= sock
->ops
->recvmsg(NULL
, sock
, &msg
,
363 len
, MSG_DONTWAIT
| MSG_TRUNC
);
364 /* TODO: Check specific error and bomb out unless EAGAIN? */
366 vhost_discard_vq_desc(vq
, 1);
369 /* TODO: Should check and handle checksum. */
371 pr_debug("Discarded truncated rx packet: "
372 " len %d > %zd\n", err
, len
);
373 vhost_discard_vq_desc(vq
, 1);
377 err
= memcpy_toiovec(vq
->hdr
, (unsigned char *)&hdr
, hdr_size
);
379 vq_err(vq
, "Unable to write vnet_hdr at addr %p: %d\n",
380 vq
->iov
->iov_base
, err
);
384 vhost_add_used_and_signal(&net
->dev
, vq
, head
, len
);
385 if (unlikely(vq_log
))
386 vhost_log_write(vq
, vq_log
, log
, len
);
388 if (unlikely(total_len
>= VHOST_NET_WEIGHT
)) {
389 vhost_poll_queue(&vq
->poll
);
394 mutex_unlock(&vq
->mutex
);
395 unuse_mm(net
->dev
.mm
);
398 /* Expects to be always run from workqueue - which acts as
399 * read-size critical section for our kind of RCU. */
400 static void handle_rx_mergeable(struct vhost_net
*net
)
402 struct vhost_virtqueue
*vq
= &net
->dev
.vqs
[VHOST_NET_VQ_RX
];
403 unsigned uninitialized_var(in
), log
;
404 struct vhost_log
*vq_log
;
405 struct msghdr msg
= {
408 .msg_control
= NULL
, /* FIXME: get and handle RX aux data. */
411 .msg_flags
= MSG_DONTWAIT
,
414 struct virtio_net_hdr_mrg_rxbuf hdr
= {
416 .hdr
.gso_type
= VIRTIO_NET_HDR_GSO_NONE
419 size_t total_len
= 0;
421 size_t vhost_hlen
, sock_hlen
;
422 size_t vhost_len
, sock_len
;
423 struct socket
*sock
= rcu_dereference(vq
->private_data
);
424 if (!sock
|| skb_queue_empty(&sock
->sk
->sk_receive_queue
))
428 mutex_lock(&vq
->mutex
);
429 vhost_disable_notify(vq
);
430 vhost_hlen
= vq
->vhost_hlen
;
431 sock_hlen
= vq
->sock_hlen
;
433 vq_log
= unlikely(vhost_has_feature(&net
->dev
, VHOST_F_LOG_ALL
)) ?
436 while ((sock_len
= peek_head_len(sock
->sk
))) {
437 sock_len
+= sock_hlen
;
438 vhost_len
= sock_len
+ vhost_hlen
;
439 headcount
= get_rx_bufs(vq
, vq
->heads
, vhost_len
,
441 /* On error, stop handling until the next kick. */
442 if (unlikely(headcount
< 0))
444 /* OK, now we need to know about added descriptors. */
446 if (unlikely(vhost_enable_notify(vq
))) {
447 /* They have slipped one in as we were
448 * doing that: check again. */
449 vhost_disable_notify(vq
);
452 /* Nothing new? Wait for eventfd to tell us
456 /* We don't need to be notified again. */
457 if (unlikely((vhost_hlen
)))
458 /* Skip header. TODO: support TSO. */
459 move_iovec_hdr(vq
->iov
, vq
->hdr
, vhost_hlen
, in
);
461 /* Copy the header for use in VIRTIO_NET_F_MRG_RXBUF:
462 * needed because sendmsg can modify msg_iov. */
463 copy_iovec_hdr(vq
->iov
, vq
->hdr
, sock_hlen
, in
);
465 err
= sock
->ops
->recvmsg(NULL
, sock
, &msg
,
466 sock_len
, MSG_DONTWAIT
| MSG_TRUNC
);
467 /* Userspace might have consumed the packet meanwhile:
468 * it's not supposed to do this usually, but might be hard
469 * to prevent. Discard data we got (if any) and keep going. */
470 if (unlikely(err
!= sock_len
)) {
471 pr_debug("Discarded rx packet: "
472 " len %d, expected %zd\n", err
, sock_len
);
473 vhost_discard_vq_desc(vq
, headcount
);
476 if (unlikely(vhost_hlen
) &&
477 memcpy_toiovecend(vq
->hdr
, (unsigned char *)&hdr
, 0,
479 vq_err(vq
, "Unable to write vnet_hdr at addr %p\n",
483 /* TODO: Should check and handle checksum. */
484 if (vhost_has_feature(&net
->dev
, VIRTIO_NET_F_MRG_RXBUF
) &&
485 memcpy_toiovecend(vq
->hdr
, (unsigned char *)&headcount
,
486 offsetof(typeof(hdr
), num_buffers
),
487 sizeof hdr
.num_buffers
)) {
488 vq_err(vq
, "Failed num_buffers write");
489 vhost_discard_vq_desc(vq
, headcount
);
492 vhost_add_used_and_signal_n(&net
->dev
, vq
, vq
->heads
,
494 if (unlikely(vq_log
))
495 vhost_log_write(vq
, vq_log
, log
, vhost_len
);
496 total_len
+= vhost_len
;
497 if (unlikely(total_len
>= VHOST_NET_WEIGHT
)) {
498 vhost_poll_queue(&vq
->poll
);
503 mutex_unlock(&vq
->mutex
);
504 unuse_mm(net
->dev
.mm
);
507 static void handle_rx(struct vhost_net
*net
)
509 if (vhost_has_feature(&net
->dev
, VIRTIO_NET_F_MRG_RXBUF
))
510 handle_rx_mergeable(net
);
515 static void handle_tx_kick(struct vhost_work
*work
)
517 struct vhost_virtqueue
*vq
= container_of(work
, struct vhost_virtqueue
,
519 struct vhost_net
*net
= container_of(vq
->dev
, struct vhost_net
, dev
);
524 static void handle_rx_kick(struct vhost_work
*work
)
526 struct vhost_virtqueue
*vq
= container_of(work
, struct vhost_virtqueue
,
528 struct vhost_net
*net
= container_of(vq
->dev
, struct vhost_net
, dev
);
533 static void handle_tx_net(struct vhost_work
*work
)
535 struct vhost_net
*net
= container_of(work
, struct vhost_net
,
536 poll
[VHOST_NET_VQ_TX
].work
);
540 static void handle_rx_net(struct vhost_work
*work
)
542 struct vhost_net
*net
= container_of(work
, struct vhost_net
,
543 poll
[VHOST_NET_VQ_RX
].work
);
547 static int vhost_net_open(struct inode
*inode
, struct file
*f
)
549 struct vhost_net
*n
= kmalloc(sizeof *n
, GFP_KERNEL
);
550 struct vhost_dev
*dev
;
557 n
->vqs
[VHOST_NET_VQ_TX
].handle_kick
= handle_tx_kick
;
558 n
->vqs
[VHOST_NET_VQ_RX
].handle_kick
= handle_rx_kick
;
559 r
= vhost_dev_init(dev
, n
->vqs
, VHOST_NET_VQ_MAX
);
565 vhost_poll_init(n
->poll
+ VHOST_NET_VQ_TX
, handle_tx_net
, POLLOUT
, dev
);
566 vhost_poll_init(n
->poll
+ VHOST_NET_VQ_RX
, handle_rx_net
, POLLIN
, dev
);
567 n
->tx_poll_state
= VHOST_NET_POLL_DISABLED
;
574 static void vhost_net_disable_vq(struct vhost_net
*n
,
575 struct vhost_virtqueue
*vq
)
577 if (!vq
->private_data
)
579 if (vq
== n
->vqs
+ VHOST_NET_VQ_TX
) {
581 n
->tx_poll_state
= VHOST_NET_POLL_DISABLED
;
583 vhost_poll_stop(n
->poll
+ VHOST_NET_VQ_RX
);
586 static void vhost_net_enable_vq(struct vhost_net
*n
,
587 struct vhost_virtqueue
*vq
)
591 sock
= rcu_dereference_protected(vq
->private_data
,
592 lockdep_is_held(&vq
->mutex
));
595 if (vq
== n
->vqs
+ VHOST_NET_VQ_TX
) {
596 n
->tx_poll_state
= VHOST_NET_POLL_STOPPED
;
597 tx_poll_start(n
, sock
);
599 vhost_poll_start(n
->poll
+ VHOST_NET_VQ_RX
, sock
->file
);
602 static struct socket
*vhost_net_stop_vq(struct vhost_net
*n
,
603 struct vhost_virtqueue
*vq
)
607 mutex_lock(&vq
->mutex
);
608 sock
= rcu_dereference_protected(vq
->private_data
,
609 lockdep_is_held(&vq
->mutex
));
610 vhost_net_disable_vq(n
, vq
);
611 rcu_assign_pointer(vq
->private_data
, NULL
);
612 mutex_unlock(&vq
->mutex
);
616 static void vhost_net_stop(struct vhost_net
*n
, struct socket
**tx_sock
,
617 struct socket
**rx_sock
)
619 *tx_sock
= vhost_net_stop_vq(n
, n
->vqs
+ VHOST_NET_VQ_TX
);
620 *rx_sock
= vhost_net_stop_vq(n
, n
->vqs
+ VHOST_NET_VQ_RX
);
623 static void vhost_net_flush_vq(struct vhost_net
*n
, int index
)
625 vhost_poll_flush(n
->poll
+ index
);
626 vhost_poll_flush(&n
->dev
.vqs
[index
].poll
);
629 static void vhost_net_flush(struct vhost_net
*n
)
631 vhost_net_flush_vq(n
, VHOST_NET_VQ_TX
);
632 vhost_net_flush_vq(n
, VHOST_NET_VQ_RX
);
635 static int vhost_net_release(struct inode
*inode
, struct file
*f
)
637 struct vhost_net
*n
= f
->private_data
;
638 struct socket
*tx_sock
;
639 struct socket
*rx_sock
;
641 vhost_net_stop(n
, &tx_sock
, &rx_sock
);
643 vhost_dev_cleanup(&n
->dev
);
648 /* We do an extra flush before freeing memory,
649 * since jobs can re-queue themselves. */
655 static struct socket
*get_raw_socket(int fd
)
658 struct sockaddr_ll sa
;
659 char buf
[MAX_ADDR_LEN
];
661 int uaddr_len
= sizeof uaddr
, r
;
662 struct socket
*sock
= sockfd_lookup(fd
, &r
);
664 return ERR_PTR(-ENOTSOCK
);
666 /* Parameter checking */
667 if (sock
->sk
->sk_type
!= SOCK_RAW
) {
668 r
= -ESOCKTNOSUPPORT
;
672 r
= sock
->ops
->getname(sock
, (struct sockaddr
*)&uaddr
.sa
,
677 if (uaddr
.sa
.sll_family
!= AF_PACKET
) {
687 static struct socket
*get_tap_socket(int fd
)
689 struct file
*file
= fget(fd
);
692 return ERR_PTR(-EBADF
);
693 sock
= tun_get_socket(file
);
696 sock
= macvtap_get_socket(file
);
702 static struct socket
*get_socket(int fd
)
705 /* special case to disable backend */
708 sock
= get_raw_socket(fd
);
711 sock
= get_tap_socket(fd
);
714 return ERR_PTR(-ENOTSOCK
);
717 static long vhost_net_set_backend(struct vhost_net
*n
, unsigned index
, int fd
)
719 struct socket
*sock
, *oldsock
;
720 struct vhost_virtqueue
*vq
;
723 mutex_lock(&n
->dev
.mutex
);
724 r
= vhost_dev_check_owner(&n
->dev
);
728 if (index
>= VHOST_NET_VQ_MAX
) {
733 mutex_lock(&vq
->mutex
);
735 /* Verify that ring has been setup correctly. */
736 if (!vhost_vq_access_ok(vq
)) {
740 sock
= get_socket(fd
);
746 /* start polling new socket */
747 oldsock
= rcu_dereference_protected(vq
->private_data
,
748 lockdep_is_held(&vq
->mutex
));
749 if (sock
!= oldsock
) {
750 vhost_net_disable_vq(n
, vq
);
751 rcu_assign_pointer(vq
->private_data
, sock
);
752 vhost_net_enable_vq(n
, vq
);
755 mutex_unlock(&vq
->mutex
);
758 vhost_net_flush_vq(n
, index
);
762 mutex_unlock(&n
->dev
.mutex
);
766 mutex_unlock(&vq
->mutex
);
768 mutex_unlock(&n
->dev
.mutex
);
772 static long vhost_net_reset_owner(struct vhost_net
*n
)
774 struct socket
*tx_sock
= NULL
;
775 struct socket
*rx_sock
= NULL
;
777 mutex_lock(&n
->dev
.mutex
);
778 err
= vhost_dev_check_owner(&n
->dev
);
781 vhost_net_stop(n
, &tx_sock
, &rx_sock
);
783 err
= vhost_dev_reset_owner(&n
->dev
);
785 mutex_unlock(&n
->dev
.mutex
);
793 static int vhost_net_set_features(struct vhost_net
*n
, u64 features
)
795 size_t vhost_hlen
, sock_hlen
, hdr_len
;
798 hdr_len
= (features
& (1 << VIRTIO_NET_F_MRG_RXBUF
)) ?
799 sizeof(struct virtio_net_hdr_mrg_rxbuf
) :
800 sizeof(struct virtio_net_hdr
);
801 if (features
& (1 << VHOST_NET_F_VIRTIO_NET_HDR
)) {
802 /* vhost provides vnet_hdr */
803 vhost_hlen
= hdr_len
;
806 /* socket provides vnet_hdr */
810 mutex_lock(&n
->dev
.mutex
);
811 if ((features
& (1 << VHOST_F_LOG_ALL
)) &&
812 !vhost_log_access_ok(&n
->dev
)) {
813 mutex_unlock(&n
->dev
.mutex
);
816 n
->dev
.acked_features
= features
;
818 for (i
= 0; i
< VHOST_NET_VQ_MAX
; ++i
) {
819 mutex_lock(&n
->vqs
[i
].mutex
);
820 n
->vqs
[i
].vhost_hlen
= vhost_hlen
;
821 n
->vqs
[i
].sock_hlen
= sock_hlen
;
822 mutex_unlock(&n
->vqs
[i
].mutex
);
825 mutex_unlock(&n
->dev
.mutex
);
829 static long vhost_net_ioctl(struct file
*f
, unsigned int ioctl
,
832 struct vhost_net
*n
= f
->private_data
;
833 void __user
*argp
= (void __user
*)arg
;
834 u64 __user
*featurep
= argp
;
835 struct vhost_vring_file backend
;
839 case VHOST_NET_SET_BACKEND
:
840 if (copy_from_user(&backend
, argp
, sizeof backend
))
842 return vhost_net_set_backend(n
, backend
.index
, backend
.fd
);
843 case VHOST_GET_FEATURES
:
844 features
= VHOST_FEATURES
;
845 if (copy_to_user(featurep
, &features
, sizeof features
))
848 case VHOST_SET_FEATURES
:
849 if (copy_from_user(&features
, featurep
, sizeof features
))
851 if (features
& ~VHOST_FEATURES
)
853 return vhost_net_set_features(n
, features
);
854 case VHOST_RESET_OWNER
:
855 return vhost_net_reset_owner(n
);
857 mutex_lock(&n
->dev
.mutex
);
858 r
= vhost_dev_ioctl(&n
->dev
, ioctl
, arg
);
860 mutex_unlock(&n
->dev
.mutex
);
866 static long vhost_net_compat_ioctl(struct file
*f
, unsigned int ioctl
,
869 return vhost_net_ioctl(f
, ioctl
, (unsigned long)compat_ptr(arg
));
873 static const struct file_operations vhost_net_fops
= {
874 .owner
= THIS_MODULE
,
875 .release
= vhost_net_release
,
876 .unlocked_ioctl
= vhost_net_ioctl
,
878 .compat_ioctl
= vhost_net_compat_ioctl
,
880 .open
= vhost_net_open
,
881 .llseek
= noop_llseek
,
884 static struct miscdevice vhost_net_misc
= {
890 static int vhost_net_init(void)
892 return misc_register(&vhost_net_misc
);
894 module_init(vhost_net_init
);
896 static void vhost_net_exit(void)
898 misc_deregister(&vhost_net_misc
);
900 module_exit(vhost_net_exit
);
902 MODULE_VERSION("0.0.1");
903 MODULE_LICENSE("GPL v2");
904 MODULE_AUTHOR("Michael S. Tsirkin");
905 MODULE_DESCRIPTION("Host kernel accelerator for virtio net");