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virtio: add packed ring types and macros

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Add types and macros for packed ring.

Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tiwei Bie
2018-11-21 18:03:18 +08:00
committed by David S. Miller
parent 4afe60a97b
commit 89a9157e12
2 changed files with 55 additions and 0 deletions
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3
include/uapi/linux/virtio_config.h
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@@ -75,6 +75,9 @@
*/ */
#define VIRTIO_F_IOMMU_PLATFORM 33 #define VIRTIO_F_IOMMU_PLATFORM 33
/* This feature indicates support for the packed virtqueue layout. */
#define VIRTIO_F_RING_PACKED 34
/* /*
* Does the device support Single Root I/O Virtualization? * Does the device support Single Root I/O Virtualization?
*/ */

52
include/uapi/linux/virtio_ring.h
View File

@@ -44,6 +44,13 @@
/* This means the buffer contains a list of buffer descriptors. */ /* This means the buffer contains a list of buffer descriptors. */
#define VRING_DESC_F_INDIRECT 4 #define VRING_DESC_F_INDIRECT 4
/*
* Mark a descriptor as available or used in packed ring.
* Notice: they are defined as shifts instead of shifted values.
*/
#define VRING_PACKED_DESC_F_AVAIL 7
#define VRING_PACKED_DESC_F_USED 15
/* The Host uses this in used->flags to advise the Guest: don't kick me when /* The Host uses this in used->flags to advise the Guest: don't kick me when
* you add a buffer. It's unreliable, so it's simply an optimization. Guest * you add a buffer. It's unreliable, so it's simply an optimization. Guest
* will still kick if it's out of buffers. */ * will still kick if it's out of buffers. */
@@ -53,6 +60,23 @@
* optimization. */ * optimization. */
#define VRING_AVAIL_F_NO_INTERRUPT 1 #define VRING_AVAIL_F_NO_INTERRUPT 1
/* Enable events in packed ring. */
#define VRING_PACKED_EVENT_FLAG_ENABLE 0x0
/* Disable events in packed ring. */
#define VRING_PACKED_EVENT_FLAG_DISABLE 0x1
/*
* Enable events for a specific descriptor in packed ring.
* (as specified by Descriptor Ring Change Event Offset/Wrap Counter).
* Only valid if VIRTIO_RING_F_EVENT_IDX has been negotiated.
*/
#define VRING_PACKED_EVENT_FLAG_DESC 0x2
/*
* Wrap counter bit shift in event suppression structure
* of packed ring.
*/
#define VRING_PACKED_EVENT_F_WRAP_CTR 15
/* We support indirect buffer descriptors */ /* We support indirect buffer descriptors */
#define VIRTIO_RING_F_INDIRECT_DESC 28 #define VIRTIO_RING_F_INDIRECT_DESC 28
@@ -171,4 +195,32 @@ static inline int vring_need_event(__u16 event_idx, __u16 new_idx, __u16 old)
return (__u16)(new_idx - event_idx - 1) < (__u16)(new_idx - old); return (__u16)(new_idx - event_idx - 1) < (__u16)(new_idx - old);
} }
struct vring_packed_desc_event {
/* Descriptor Ring Change Event Offset/Wrap Counter. */
__le16 off_wrap;
/* Descriptor Ring Change Event Flags. */
__le16 flags;
};
struct vring_packed_desc {
/* Buffer Address. */
__le64 addr;
/* Buffer Length. */
__le32 len;
/* Buffer ID. */
__le16 id;
/* The flags depending on descriptor type. */
__le16 flags;
};
struct vring_packed {
unsigned int num;
struct vring_packed_desc *desc;
struct vring_packed_desc_event *driver;
struct vring_packed_desc_event *device;
};
#endif /* _UAPI_LINUX_VIRTIO_RING_H */ #endif /* _UAPI_LINUX_VIRTIO_RING_H */