Re: [PATCH net-next v2 3/5] virtio_ring: add packed ring support

This commit introduces the support (without EVENT_IDX) for
packed ring.

Signed-off-by: Tiwei Bie <redacted>
---
 drivers/virtio/virtio_ring.c | 495 ++++++++++++++++++++++++++++++++++-
 1 file changed, 487 insertions(+), 8 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index c4f8abc7445a..f317b485ba54 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c

@@ -55,12 +55,21 @@
 #define END_USE(vq)
 #endif
 
+#define _VRING_DESC_F_AVAIL(b)	((__u16)(b) << 7)
+#define _VRING_DESC_F_USED(b)	((__u16)(b) << 15)
+
 struct vring_desc_state {
 	void *data;			/* Data for callback. */
 	struct vring_desc *indir_desc;	/* Indirect descriptor, if any. */
 };
 
 struct vring_desc_state_packed {
+	void *data;			/* Data for callback. */
+	struct vring_packed_desc *indir_desc; /* Indirect descriptor, if any. */
+	int num;			/* Descriptor list length. */
+	dma_addr_t addr;		/* Buffer DMA addr. */
+	u32 len;			/* Buffer length. */
+	u16 flags;			/* Descriptor flags. */
 	int next;			/* The next desc state. */
 };