virtio: add packed ring types and macros
Add types and macros for packed ring. Signed-off-by: NTiwei Bie <tiwei.bie@intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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Add types and macros for packed ring. Signed-off-by: NTiwei Bie <tiwei.bie@intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>