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Commit 89a9157e authored by Tiwei Bie's avatar Tiwei Bie Committed by David S. Miller
Browse files

virtio: add packed ring types and macros 



Add types and macros for packed ring.

Signed-off-by: default avatarTiwei Bie <tiwei.bie@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4afe60a9

include/uapi/linux/virtio_config.h

+3 −0
Original line number Diff line number Diff line
@@ -75,6 +75,9 @@ 
 */

#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?

 */

include/uapi/linux/virtio_ring.h

+52 −0
Original line number Diff line number Diff line
@@ -44,6 +44,13 @@ 
/* This means the buffer contains a list of buffer descriptors. */

#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

 * you add a buffer.  It's unreliable, so it's simply an optimization.  Guest

 * will still kick if it's out of buffers. */
@@ -53,6 +60,23 @@ 
 * optimization.  */

#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 */

#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);

}



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 */