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virtio: basic structure for packed ring 

Define packed ring structure according to Qemu nomenclature,
field data(wrap counter, etc) are also included.

Signed-off-by: Wei Xu <wexu@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Reviewed-by: Jens Freimann <jfreimann@redhat.com>
Message-Id: <20191025083527.30803-2-eperezma@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
master
Wei Xu 2019-10-25 10:35:20 +02:00 committed by Michael S. Tsirkin
parent 58560ad254
commit a40dcec9fc
1 changed files with 15 additions and 0 deletions
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15
hw/virtio/virtio.c
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@ -43,6 +43,13 @@ typedef struct VRingDesc
uint16_t next;
} VRingDesc;
typedef struct VRingPackedDesc {
uint64_t addr;
uint32_t len;
uint16_t id;
uint16_t flags;
} VRingPackedDesc;
typedef struct VRingAvail
{
uint16_t flags;
@ -81,17 +88,25 @@ typedef struct VRing
VRingMemoryRegionCaches *caches;
} VRing;
typedef struct VRingPackedDescEvent {
uint16_t off_wrap;
uint16_t flags;
} VRingPackedDescEvent ;
struct VirtQueue
{
VRing vring;
/* Next head to pop */
uint16_t last_avail_idx;
bool last_avail_wrap_counter;
/* Last avail_idx read from VQ. */
uint16_t shadow_avail_idx;
bool shadow_avail_wrap_counter;
uint16_t used_idx;
bool used_wrap_counter;
/* Last used index value we have signalled on */
uint16_t signalled_used;