diff options
author | Yang Zhang <yang.z.zhang@intel.com> | 2015-08-28 09:58:54 +0800 |
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committer | Yang Zhang <yang.z.zhang@intel.com> | 2015-09-01 12:44:00 +0800 |
commit | e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch) | |
tree | 66b09f592c55df2878107a468a91d21506104d3f /qemu/include/hw/virtio/dataplane/vring.h | |
parent | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (diff) |
Add qemu 2.4.0
Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Diffstat (limited to 'qemu/include/hw/virtio/dataplane/vring.h')
-rw-r--r-- | qemu/include/hw/virtio/dataplane/vring.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/qemu/include/hw/virtio/dataplane/vring.h b/qemu/include/hw/virtio/dataplane/vring.h new file mode 100644 index 000000000..8d97db9e2 --- /dev/null +++ b/qemu/include/hw/virtio/dataplane/vring.h @@ -0,0 +1,49 @@ +/* Copyright 2012 Red Hat, Inc. and/or its affiliates + * Copyright IBM, Corp. 2012 + * + * Based on Linux 2.6.39 vhost code: + * Copyright (C) 2009 Red Hat, Inc. + * Copyright (C) 2006 Rusty Russell IBM Corporation + * + * Author: Michael S. Tsirkin <mst@redhat.com> + * Stefan Hajnoczi <stefanha@redhat.com> + * + * Inspiration, some code, and most witty comments come from + * Documentation/virtual/lguest/lguest.c, by Rusty Russell + * + * This work is licensed under the terms of the GNU GPL, version 2. + */ + +#ifndef VRING_H +#define VRING_H + +#include "qemu-common.h" +#include "standard-headers/linux/virtio_ring.h" +#include "hw/virtio/virtio.h" + +typedef struct { + MemoryRegion *mr; /* memory region containing the vring */ + struct vring vr; /* virtqueue vring mapped to host memory */ + uint16_t last_avail_idx; /* last processed avail ring index */ + uint16_t last_used_idx; /* last processed used ring index */ + uint16_t signalled_used; /* EVENT_IDX state */ + bool signalled_used_valid; + bool broken; /* was there a fatal error? */ +} Vring; + +/* Fail future vring_pop() and vring_push() calls until reset */ +static inline void vring_set_broken(Vring *vring) +{ + vring->broken = true; +} + +bool vring_setup(Vring *vring, VirtIODevice *vdev, int n); +void vring_teardown(Vring *vring, VirtIODevice *vdev, int n); +void vring_disable_notification(VirtIODevice *vdev, Vring *vring); +bool vring_enable_notification(VirtIODevice *vdev, Vring *vring); +bool vring_should_notify(VirtIODevice *vdev, Vring *vring); +int vring_pop(VirtIODevice *vdev, Vring *vring, VirtQueueElement *elem); +void vring_push(VirtIODevice *vdev, Vring *vring, VirtQueueElement *elem, + int len); + +#endif /* VRING_H */ |