root / include / hw / virtio / dataplane / vring.h @ 9154b02c
History | View | Annotate | Download (2 kB)
1 | 88807f89 | Stefan Hajnoczi | /* Copyright 2012 Red Hat, Inc. and/or its affiliates
|
---|---|---|---|
2 | 88807f89 | Stefan Hajnoczi | * Copyright IBM, Corp. 2012
|
3 | 88807f89 | Stefan Hajnoczi | *
|
4 | 88807f89 | Stefan Hajnoczi | * Based on Linux 2.6.39 vhost code:
|
5 | 88807f89 | Stefan Hajnoczi | * Copyright (C) 2009 Red Hat, Inc.
|
6 | 88807f89 | Stefan Hajnoczi | * Copyright (C) 2006 Rusty Russell IBM Corporation
|
7 | 88807f89 | Stefan Hajnoczi | *
|
8 | 88807f89 | Stefan Hajnoczi | * Author: Michael S. Tsirkin <mst@redhat.com>
|
9 | 88807f89 | Stefan Hajnoczi | * Stefan Hajnoczi <stefanha@redhat.com>
|
10 | 88807f89 | Stefan Hajnoczi | *
|
11 | 88807f89 | Stefan Hajnoczi | * Inspiration, some code, and most witty comments come from
|
12 | 88807f89 | Stefan Hajnoczi | * Documentation/virtual/lguest/lguest.c, by Rusty Russell
|
13 | 88807f89 | Stefan Hajnoczi | *
|
14 | 88807f89 | Stefan Hajnoczi | * This work is licensed under the terms of the GNU GPL, version 2.
|
15 | 88807f89 | Stefan Hajnoczi | */
|
16 | 88807f89 | Stefan Hajnoczi | |
17 | 88807f89 | Stefan Hajnoczi | #ifndef VRING_H
|
18 | 88807f89 | Stefan Hajnoczi | #define VRING_H
|
19 | 88807f89 | Stefan Hajnoczi | |
20 | 88807f89 | Stefan Hajnoczi | #include <linux/virtio_ring.h> |
21 | 88807f89 | Stefan Hajnoczi | #include "qemu-common.h" |
22 | 83c9f4ca | Paolo Bonzini | #include "hostmem.h" |
23 | 0d09e41a | Paolo Bonzini | #include "hw/virtio/virtio.h" |
24 | 88807f89 | Stefan Hajnoczi | |
25 | 88807f89 | Stefan Hajnoczi | typedef struct { |
26 | 88807f89 | Stefan Hajnoczi | HostMem hostmem; /* guest memory mapper */
|
27 | 88807f89 | Stefan Hajnoczi | struct vring vr; /* virtqueue vring mapped to host memory */ |
28 | 88807f89 | Stefan Hajnoczi | uint16_t last_avail_idx; /* last processed avail ring index */
|
29 | 88807f89 | Stefan Hajnoczi | uint16_t last_used_idx; /* last processed used ring index */
|
30 | 88807f89 | Stefan Hajnoczi | uint16_t signalled_used; /* EVENT_IDX state */
|
31 | 88807f89 | Stefan Hajnoczi | bool signalled_used_valid;
|
32 | 88807f89 | Stefan Hajnoczi | bool broken; /* was there a fatal error? */ |
33 | 88807f89 | Stefan Hajnoczi | } Vring; |
34 | 88807f89 | Stefan Hajnoczi | |
35 | 88807f89 | Stefan Hajnoczi | static inline unsigned int vring_get_num(Vring *vring) |
36 | 88807f89 | Stefan Hajnoczi | { |
37 | 88807f89 | Stefan Hajnoczi | return vring->vr.num;
|
38 | 88807f89 | Stefan Hajnoczi | } |
39 | 88807f89 | Stefan Hajnoczi | |
40 | 88807f89 | Stefan Hajnoczi | /* Are there more descriptors available? */
|
41 | 88807f89 | Stefan Hajnoczi | static inline bool vring_more_avail(Vring *vring) |
42 | 88807f89 | Stefan Hajnoczi | { |
43 | 88807f89 | Stefan Hajnoczi | return vring->vr.avail->idx != vring->last_avail_idx;
|
44 | 88807f89 | Stefan Hajnoczi | } |
45 | 88807f89 | Stefan Hajnoczi | |
46 | 88807f89 | Stefan Hajnoczi | /* Fail future vring_pop() and vring_push() calls until reset */
|
47 | 88807f89 | Stefan Hajnoczi | static inline void vring_set_broken(Vring *vring) |
48 | 88807f89 | Stefan Hajnoczi | { |
49 | 88807f89 | Stefan Hajnoczi | vring->broken = true;
|
50 | 88807f89 | Stefan Hajnoczi | } |
51 | 88807f89 | Stefan Hajnoczi | |
52 | 88807f89 | Stefan Hajnoczi | bool vring_setup(Vring *vring, VirtIODevice *vdev, int n); |
53 | 9154b02c | Stefan Hajnoczi | void vring_teardown(Vring *vring, VirtIODevice *vdev, int n); |
54 | 88807f89 | Stefan Hajnoczi | void vring_disable_notification(VirtIODevice *vdev, Vring *vring);
|
55 | 88807f89 | Stefan Hajnoczi | bool vring_enable_notification(VirtIODevice *vdev, Vring *vring);
|
56 | 88807f89 | Stefan Hajnoczi | bool vring_should_notify(VirtIODevice *vdev, Vring *vring);
|
57 | 88807f89 | Stefan Hajnoczi | int vring_pop(VirtIODevice *vdev, Vring *vring,
|
58 | 88807f89 | Stefan Hajnoczi | struct iovec iov[], struct iovec *iov_end, |
59 | 88807f89 | Stefan Hajnoczi | unsigned int *out_num, unsigned int *in_num); |
60 | 88807f89 | Stefan Hajnoczi | void vring_push(Vring *vring, unsigned int head, int len); |
61 | 88807f89 | Stefan Hajnoczi | |
62 | 88807f89 | Stefan Hajnoczi | #endif /* VRING_H */ |