[RFC v4 2/5] virtio_ring: support creating packed ring

This commit introduces the support for creating packed ring. All split ring specific functions are added _split suffix. Some necessary stubs for packed ring are also added. Signed-off-by: Tiwei Bie --- drivers/virtio/virtio_ring.c | 764 +++

[RFC v4 2/5] virtio_ring: support creating packed ring

This commit introduces the support for creating packed ring. All split ring specific functions are added _split suffix. Some necessary stubs for packed ring are also added. Signed-off-by: Tiwei Bie --- drivers/virtio/virtio_ring.c | 764 +++