diff options
Diffstat (limited to 'src/include/hw/virtio/dataplane/vring.h')
| -rw-r--r-- | src/include/hw/virtio/dataplane/vring.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/src/include/hw/virtio/dataplane/vring.h b/src/include/hw/virtio/dataplane/vring.h new file mode 100644 index 0000000..a596e4c --- /dev/null +++ b/src/include/hw/virtio/dataplane/vring.h @@ -0,0 +1,51 @@ +/* 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_desc; /* memory region for the vring desc */ + MemoryRegion *mr_avail; /* memory region for the vring avail */ + MemoryRegion *mr_used; /* memory region for the vring used */ + 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 */ |
