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 sock
= rcu_dereference_check(vq
->private_data
,
133 lockdep_is_held(&vq
->mutex
));
137 wmem
= atomic_read(&sock
->sk
->sk_wmem_alloc
);
138 if (wmem
>= sock
->sk
->sk_sndbuf
) {
139 mutex_lock(&vq
->mutex
);
140 tx_poll_start(net
, sock
);
141 mutex_unlock(&vq
->mutex
);
146 mutex_lock(&vq
->mutex
);
147 vhost_disable_notify(vq
);
149 if (wmem
< sock
->sk
->sk_sndbuf
/ 2)
151 hdr_size
= vq
->vhost_hlen
;
154 head
= vhost_get_vq_desc(&net
->dev
, vq
, vq
->iov
,
158 /* On error, stop handling until the next kick. */
159 if (unlikely(head
< 0))
161 /* Nothing new? Wait for eventfd to tell us they refilled. */
162 if (head
== vq
->num
) {
163 wmem
= atomic_read(&sock
->sk
->sk_wmem_alloc
);
164 if (wmem
>= sock
->sk
->sk_sndbuf
* 3 / 4) {
165 tx_poll_start(net
, sock
);
166 set_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
);
169 if (unlikely(vhost_enable_notify(vq
))) {
170 vhost_disable_notify(vq
);
176 vq_err(vq
, "Unexpected descriptor format for TX: "
177 "out %d, int %d\n", out
, in
);
180 /* Skip header. TODO: support TSO. */
181 s
= move_iovec_hdr(vq
->iov
, vq
->hdr
, hdr_size
, out
);
182 msg
.msg_iovlen
= out
;
183 len
= iov_length(vq
->iov
, out
);
186 vq_err(vq
, "Unexpected header len for TX: "
187 "%zd expected %zd\n",
188 iov_length(vq
->hdr
, s
), hdr_size
);
191 /* TODO: Check specific error and bomb out unless ENOBUFS? */
192 err
= sock
->ops
->sendmsg(NULL
, sock
, &msg
, len
);
193 if (unlikely(err
< 0)) {
194 vhost_discard_vq_desc(vq
, 1);
195 tx_poll_start(net
, sock
);
199 pr_debug("Truncated TX packet: "
200 " len %d != %zd\n", err
, len
);
201 vhost_add_used_and_signal(&net
->dev
, vq
, head
, 0);
203 if (unlikely(total_len
>= VHOST_NET_WEIGHT
)) {
204 vhost_poll_queue(&vq
->poll
);
209 mutex_unlock(&vq
->mutex
);
210 unuse_mm(net
->dev
.mm
);
213 static int peek_head_len(struct sock
*sk
)
215 struct sk_buff
*head
;
219 head
= skb_peek(&sk
->sk_receive_queue
);
226 /* This is a multi-buffer version of vhost_get_desc, that works if
227 * vq has read descriptors only.
228 * @vq - the relevant virtqueue
229 * @datalen - data length we'll be reading
230 * @iovcount - returned count of io vectors we fill
232 * @log_num - log offset
233 * returns number of buffer heads allocated, negative on error
235 static int get_rx_bufs(struct vhost_virtqueue
*vq
,
236 struct vring_used_elem
*heads
,
239 struct vhost_log
*log
,
242 unsigned int out
, in
;
248 while (datalen
> 0) {
249 if (unlikely(seg
>= UIO_MAXIOV
)) {
253 d
= vhost_get_vq_desc(vq
->dev
, vq
, vq
->iov
+ seg
,
254 ARRAY_SIZE(vq
->iov
) - seg
, &out
,
260 if (unlikely(out
|| in
<= 0)) {
261 vq_err(vq
, "unexpected descriptor format for RX: "
262 "out %d, in %d\n", out
, in
);
270 heads
[headcount
].id
= d
;
271 heads
[headcount
].len
= iov_length(vq
->iov
+ seg
, in
);
272 datalen
-= heads
[headcount
].len
;
276 heads
[headcount
- 1].len
+= datalen
;
282 vhost_discard_vq_desc(vq
, headcount
);
286 /* Expects to be always run from workqueue - which acts as
287 * read-size critical section for our kind of RCU. */
288 static void handle_rx_big(struct vhost_net
*net
)
290 struct vhost_virtqueue
*vq
= &net
->dev
.vqs
[VHOST_NET_VQ_RX
];
291 unsigned out
, in
, log
, s
;
293 struct vhost_log
*vq_log
;
294 struct msghdr msg
= {
297 .msg_control
= NULL
, /* FIXME: get and handle RX aux data. */
300 .msg_flags
= MSG_DONTWAIT
,
303 struct virtio_net_hdr hdr
= {
305 .gso_type
= VIRTIO_NET_HDR_GSO_NONE
308 size_t len
, total_len
= 0;
311 struct socket
*sock
= rcu_dereference(vq
->private_data
);
312 if (!sock
|| skb_queue_empty(&sock
->sk
->sk_receive_queue
))
316 mutex_lock(&vq
->mutex
);
317 vhost_disable_notify(vq
);
318 hdr_size
= vq
->vhost_hlen
;
320 vq_log
= unlikely(vhost_has_feature(&net
->dev
, VHOST_F_LOG_ALL
)) ?
324 head
= vhost_get_vq_desc(&net
->dev
, vq
, vq
->iov
,
328 /* On error, stop handling until the next kick. */
329 if (unlikely(head
< 0))
331 /* OK, now we need to know about added descriptors. */
332 if (head
== vq
->num
) {
333 if (unlikely(vhost_enable_notify(vq
))) {
334 /* They have slipped one in as we were
335 * doing that: check again. */
336 vhost_disable_notify(vq
);
339 /* Nothing new? Wait for eventfd to tell us
343 /* We don't need to be notified again. */
345 vq_err(vq
, "Unexpected descriptor format for RX: "
350 /* Skip header. TODO: support TSO/mergeable rx buffers. */
351 s
= move_iovec_hdr(vq
->iov
, vq
->hdr
, hdr_size
, in
);
353 len
= iov_length(vq
->iov
, in
);
356 vq_err(vq
, "Unexpected header len for RX: "
357 "%zd expected %zd\n",
358 iov_length(vq
->hdr
, s
), hdr_size
);
361 err
= sock
->ops
->recvmsg(NULL
, sock
, &msg
,
362 len
, MSG_DONTWAIT
| MSG_TRUNC
);
363 /* TODO: Check specific error and bomb out unless EAGAIN? */
365 vhost_discard_vq_desc(vq
, 1);
368 /* TODO: Should check and handle checksum. */
370 pr_debug("Discarded truncated rx packet: "
371 " len %d > %zd\n", err
, len
);
372 vhost_discard_vq_desc(vq
, 1);
376 err
= memcpy_toiovec(vq
->hdr
, (unsigned char *)&hdr
, hdr_size
);
378 vq_err(vq
, "Unable to write vnet_hdr at addr %p: %d\n",
379 vq
->iov
->iov_base
, err
);
383 vhost_add_used_and_signal(&net
->dev
, vq
, head
, len
);
384 if (unlikely(vq_log
))
385 vhost_log_write(vq
, vq_log
, log
, len
);
387 if (unlikely(total_len
>= VHOST_NET_WEIGHT
)) {
388 vhost_poll_queue(&vq
->poll
);
393 mutex_unlock(&vq
->mutex
);
394 unuse_mm(net
->dev
.mm
);
397 /* Expects to be always run from workqueue - which acts as
398 * read-size critical section for our kind of RCU. */
399 static void handle_rx_mergeable(struct vhost_net
*net
)
401 struct vhost_virtqueue
*vq
= &net
->dev
.vqs
[VHOST_NET_VQ_RX
];
402 unsigned uninitialized_var(in
), log
;
403 struct vhost_log
*vq_log
;
404 struct msghdr msg
= {
407 .msg_control
= NULL
, /* FIXME: get and handle RX aux data. */
410 .msg_flags
= MSG_DONTWAIT
,
413 struct virtio_net_hdr_mrg_rxbuf hdr
= {
415 .hdr
.gso_type
= VIRTIO_NET_HDR_GSO_NONE
418 size_t total_len
= 0;
420 size_t vhost_hlen
, sock_hlen
;
421 size_t vhost_len
, sock_len
;
422 struct socket
*sock
= rcu_dereference(vq
->private_data
);
423 if (!sock
|| skb_queue_empty(&sock
->sk
->sk_receive_queue
))
427 mutex_lock(&vq
->mutex
);
428 vhost_disable_notify(vq
);
429 vhost_hlen
= vq
->vhost_hlen
;
430 sock_hlen
= vq
->sock_hlen
;
432 vq_log
= unlikely(vhost_has_feature(&net
->dev
, VHOST_F_LOG_ALL
)) ?
435 while ((sock_len
= peek_head_len(sock
->sk
))) {
436 sock_len
+= sock_hlen
;
437 vhost_len
= sock_len
+ vhost_hlen
;
438 headcount
= get_rx_bufs(vq
, vq
->heads
, vhost_len
,
440 /* On error, stop handling until the next kick. */
441 if (unlikely(headcount
< 0))
443 /* OK, now we need to know about added descriptors. */
445 if (unlikely(vhost_enable_notify(vq
))) {
446 /* They have slipped one in as we were
447 * doing that: check again. */
448 vhost_disable_notify(vq
);
451 /* Nothing new? Wait for eventfd to tell us
455 /* We don't need to be notified again. */
456 if (unlikely((vhost_hlen
)))
457 /* Skip header. TODO: support TSO. */
458 move_iovec_hdr(vq
->iov
, vq
->hdr
, vhost_hlen
, in
);
460 /* Copy the header for use in VIRTIO_NET_F_MRG_RXBUF:
461 * needed because sendmsg can modify msg_iov. */
462 copy_iovec_hdr(vq
->iov
, vq
->hdr
, sock_hlen
, in
);
464 err
= sock
->ops
->recvmsg(NULL
, sock
, &msg
,
465 sock_len
, MSG_DONTWAIT
| MSG_TRUNC
);
466 /* Userspace might have consumed the packet meanwhile:
467 * it's not supposed to do this usually, but might be hard
468 * to prevent. Discard data we got (if any) and keep going. */
469 if (unlikely(err
!= sock_len
)) {
470 pr_debug("Discarded rx packet: "
471 " len %d, expected %zd\n", err
, sock_len
);
472 vhost_discard_vq_desc(vq
, headcount
);
475 if (unlikely(vhost_hlen
) &&
476 memcpy_toiovecend(vq
->hdr
, (unsigned char *)&hdr
, 0,
478 vq_err(vq
, "Unable to write vnet_hdr at addr %p\n",
482 /* TODO: Should check and handle checksum. */
483 if (vhost_has_feature(&net
->dev
, VIRTIO_NET_F_MRG_RXBUF
) &&
484 memcpy_toiovecend(vq
->hdr
, (unsigned char *)&headcount
,
485 offsetof(typeof(hdr
), num_buffers
),
486 sizeof hdr
.num_buffers
)) {
487 vq_err(vq
, "Failed num_buffers write");
488 vhost_discard_vq_desc(vq
, headcount
);
491 vhost_add_used_and_signal_n(&net
->dev
, vq
, vq
->heads
,
493 if (unlikely(vq_log
))
494 vhost_log_write(vq
, vq_log
, log
, vhost_len
);
495 total_len
+= vhost_len
;
496 if (unlikely(total_len
>= VHOST_NET_WEIGHT
)) {
497 vhost_poll_queue(&vq
->poll
);
502 mutex_unlock(&vq
->mutex
);
503 unuse_mm(net
->dev
.mm
);
506 static void handle_rx(struct vhost_net
*net
)
508 if (vhost_has_feature(&net
->dev
, VIRTIO_NET_F_MRG_RXBUF
))
509 handle_rx_mergeable(net
);
514 static void handle_tx_kick(struct vhost_work
*work
)
516 struct vhost_virtqueue
*vq
= container_of(work
, struct vhost_virtqueue
,
518 struct vhost_net
*net
= container_of(vq
->dev
, struct vhost_net
, dev
);
523 static void handle_rx_kick(struct vhost_work
*work
)
525 struct vhost_virtqueue
*vq
= container_of(work
, struct vhost_virtqueue
,
527 struct vhost_net
*net
= container_of(vq
->dev
, struct vhost_net
, dev
);
532 static void handle_tx_net(struct vhost_work
*work
)
534 struct vhost_net
*net
= container_of(work
, struct vhost_net
,
535 poll
[VHOST_NET_VQ_TX
].work
);
539 static void handle_rx_net(struct vhost_work
*work
)
541 struct vhost_net
*net
= container_of(work
, struct vhost_net
,
542 poll
[VHOST_NET_VQ_RX
].work
);
546 static int vhost_net_open(struct inode
*inode
, struct file
*f
)
548 struct vhost_net
*n
= kmalloc(sizeof *n
, GFP_KERNEL
);
549 struct vhost_dev
*dev
;
556 n
->vqs
[VHOST_NET_VQ_TX
].handle_kick
= handle_tx_kick
;
557 n
->vqs
[VHOST_NET_VQ_RX
].handle_kick
= handle_rx_kick
;
558 r
= vhost_dev_init(dev
, n
->vqs
, VHOST_NET_VQ_MAX
);
564 vhost_poll_init(n
->poll
+ VHOST_NET_VQ_TX
, handle_tx_net
, POLLOUT
, dev
);
565 vhost_poll_init(n
->poll
+ VHOST_NET_VQ_RX
, handle_rx_net
, POLLIN
, dev
);
566 n
->tx_poll_state
= VHOST_NET_POLL_DISABLED
;
573 static void vhost_net_disable_vq(struct vhost_net
*n
,
574 struct vhost_virtqueue
*vq
)
576 if (!vq
->private_data
)
578 if (vq
== n
->vqs
+ VHOST_NET_VQ_TX
) {
580 n
->tx_poll_state
= VHOST_NET_POLL_DISABLED
;
582 vhost_poll_stop(n
->poll
+ VHOST_NET_VQ_RX
);
585 static void vhost_net_enable_vq(struct vhost_net
*n
,
586 struct vhost_virtqueue
*vq
)
590 sock
= rcu_dereference_protected(vq
->private_data
,
591 lockdep_is_held(&vq
->mutex
));
594 if (vq
== n
->vqs
+ VHOST_NET_VQ_TX
) {
595 n
->tx_poll_state
= VHOST_NET_POLL_STOPPED
;
596 tx_poll_start(n
, sock
);
598 vhost_poll_start(n
->poll
+ VHOST_NET_VQ_RX
, sock
->file
);
601 static struct socket
*vhost_net_stop_vq(struct vhost_net
*n
,
602 struct vhost_virtqueue
*vq
)
606 mutex_lock(&vq
->mutex
);
607 sock
= rcu_dereference_protected(vq
->private_data
,
608 lockdep_is_held(&vq
->mutex
));
609 vhost_net_disable_vq(n
, vq
);
610 rcu_assign_pointer(vq
->private_data
, NULL
);
611 mutex_unlock(&vq
->mutex
);
615 static void vhost_net_stop(struct vhost_net
*n
, struct socket
**tx_sock
,
616 struct socket
**rx_sock
)
618 *tx_sock
= vhost_net_stop_vq(n
, n
->vqs
+ VHOST_NET_VQ_TX
);
619 *rx_sock
= vhost_net_stop_vq(n
, n
->vqs
+ VHOST_NET_VQ_RX
);
622 static void vhost_net_flush_vq(struct vhost_net
*n
, int index
)
624 vhost_poll_flush(n
->poll
+ index
);
625 vhost_poll_flush(&n
->dev
.vqs
[index
].poll
);
628 static void vhost_net_flush(struct vhost_net
*n
)
630 vhost_net_flush_vq(n
, VHOST_NET_VQ_TX
);
631 vhost_net_flush_vq(n
, VHOST_NET_VQ_RX
);
634 static int vhost_net_release(struct inode
*inode
, struct file
*f
)
636 struct vhost_net
*n
= f
->private_data
;
637 struct socket
*tx_sock
;
638 struct socket
*rx_sock
;
640 vhost_net_stop(n
, &tx_sock
, &rx_sock
);
642 vhost_dev_cleanup(&n
->dev
);
647 /* We do an extra flush before freeing memory,
648 * since jobs can re-queue themselves. */
654 static struct socket
*get_raw_socket(int fd
)
657 struct sockaddr_ll sa
;
658 char buf
[MAX_ADDR_LEN
];
660 int uaddr_len
= sizeof uaddr
, r
;
661 struct socket
*sock
= sockfd_lookup(fd
, &r
);
663 return ERR_PTR(-ENOTSOCK
);
665 /* Parameter checking */
666 if (sock
->sk
->sk_type
!= SOCK_RAW
) {
667 r
= -ESOCKTNOSUPPORT
;
671 r
= sock
->ops
->getname(sock
, (struct sockaddr
*)&uaddr
.sa
,
676 if (uaddr
.sa
.sll_family
!= AF_PACKET
) {
686 static struct socket
*get_tap_socket(int fd
)
688 struct file
*file
= fget(fd
);
691 return ERR_PTR(-EBADF
);
692 sock
= tun_get_socket(file
);
695 sock
= macvtap_get_socket(file
);
701 static struct socket
*get_socket(int fd
)
704 /* special case to disable backend */
707 sock
= get_raw_socket(fd
);
710 sock
= get_tap_socket(fd
);
713 return ERR_PTR(-ENOTSOCK
);
716 static long vhost_net_set_backend(struct vhost_net
*n
, unsigned index
, int fd
)
718 struct socket
*sock
, *oldsock
;
719 struct vhost_virtqueue
*vq
;
722 mutex_lock(&n
->dev
.mutex
);
723 r
= vhost_dev_check_owner(&n
->dev
);
727 if (index
>= VHOST_NET_VQ_MAX
) {
732 mutex_lock(&vq
->mutex
);
734 /* Verify that ring has been setup correctly. */
735 if (!vhost_vq_access_ok(vq
)) {
739 sock
= get_socket(fd
);
745 /* start polling new socket */
746 oldsock
= rcu_dereference_protected(vq
->private_data
,
747 lockdep_is_held(&vq
->mutex
));
748 if (sock
!= oldsock
) {
749 vhost_net_disable_vq(n
, vq
);
750 rcu_assign_pointer(vq
->private_data
, sock
);
751 vhost_net_enable_vq(n
, vq
);
754 mutex_unlock(&vq
->mutex
);
757 vhost_net_flush_vq(n
, index
);
761 mutex_unlock(&n
->dev
.mutex
);
765 mutex_unlock(&vq
->mutex
);
767 mutex_unlock(&n
->dev
.mutex
);
771 static long vhost_net_reset_owner(struct vhost_net
*n
)
773 struct socket
*tx_sock
= NULL
;
774 struct socket
*rx_sock
= NULL
;
776 mutex_lock(&n
->dev
.mutex
);
777 err
= vhost_dev_check_owner(&n
->dev
);
780 vhost_net_stop(n
, &tx_sock
, &rx_sock
);
782 err
= vhost_dev_reset_owner(&n
->dev
);
784 mutex_unlock(&n
->dev
.mutex
);
792 static int vhost_net_set_features(struct vhost_net
*n
, u64 features
)
794 size_t vhost_hlen
, sock_hlen
, hdr_len
;
797 hdr_len
= (features
& (1 << VIRTIO_NET_F_MRG_RXBUF
)) ?
798 sizeof(struct virtio_net_hdr_mrg_rxbuf
) :
799 sizeof(struct virtio_net_hdr
);
800 if (features
& (1 << VHOST_NET_F_VIRTIO_NET_HDR
)) {
801 /* vhost provides vnet_hdr */
802 vhost_hlen
= hdr_len
;
805 /* socket provides vnet_hdr */
809 mutex_lock(&n
->dev
.mutex
);
810 if ((features
& (1 << VHOST_F_LOG_ALL
)) &&
811 !vhost_log_access_ok(&n
->dev
)) {
812 mutex_unlock(&n
->dev
.mutex
);
815 n
->dev
.acked_features
= features
;
817 for (i
= 0; i
< VHOST_NET_VQ_MAX
; ++i
) {
818 mutex_lock(&n
->vqs
[i
].mutex
);
819 n
->vqs
[i
].vhost_hlen
= vhost_hlen
;
820 n
->vqs
[i
].sock_hlen
= sock_hlen
;
821 mutex_unlock(&n
->vqs
[i
].mutex
);
824 mutex_unlock(&n
->dev
.mutex
);
828 static long vhost_net_ioctl(struct file
*f
, unsigned int ioctl
,
831 struct vhost_net
*n
= f
->private_data
;
832 void __user
*argp
= (void __user
*)arg
;
833 u64 __user
*featurep
= argp
;
834 struct vhost_vring_file backend
;
838 case VHOST_NET_SET_BACKEND
:
839 if (copy_from_user(&backend
, argp
, sizeof backend
))
841 return vhost_net_set_backend(n
, backend
.index
, backend
.fd
);
842 case VHOST_GET_FEATURES
:
843 features
= VHOST_FEATURES
;
844 if (copy_to_user(featurep
, &features
, sizeof features
))
847 case VHOST_SET_FEATURES
:
848 if (copy_from_user(&features
, featurep
, sizeof features
))
850 if (features
& ~VHOST_FEATURES
)
852 return vhost_net_set_features(n
, features
);
853 case VHOST_RESET_OWNER
:
854 return vhost_net_reset_owner(n
);
856 mutex_lock(&n
->dev
.mutex
);
857 r
= vhost_dev_ioctl(&n
->dev
, ioctl
, arg
);
859 mutex_unlock(&n
->dev
.mutex
);
865 static long vhost_net_compat_ioctl(struct file
*f
, unsigned int ioctl
,
868 return vhost_net_ioctl(f
, ioctl
, (unsigned long)compat_ptr(arg
));
872 static const struct file_operations vhost_net_fops
= {
873 .owner
= THIS_MODULE
,
874 .release
= vhost_net_release
,
875 .unlocked_ioctl
= vhost_net_ioctl
,
877 .compat_ioctl
= vhost_net_compat_ioctl
,
879 .open
= vhost_net_open
,
880 .llseek
= noop_llseek
,
883 static struct miscdevice vhost_net_misc
= {
889 static int vhost_net_init(void)
891 return misc_register(&vhost_net_misc
);
893 module_init(vhost_net_init
);
895 static void vhost_net_exit(void)
897 misc_deregister(&vhost_net_misc
);
899 module_exit(vhost_net_exit
);
901 MODULE_VERSION("0.0.1");
902 MODULE_LICENSE("GPL v2");
903 MODULE_AUTHOR("Michael S. Tsirkin");
904 MODULE_DESCRIPTION("Host kernel accelerator for virtio net");