[dpdk-dev] [PATCH 4/7] net/virtio: free IN_ORDER descriptors

[Marvin Liu <yong.liu@intel.com>]

Add new function for freeing IN_ORDER descriptors. As descriptors will
be allocated and freed sequentially when IN_ORDER feature was
negotiated. There will be no need to utilize chain for descriptors
management, only index update is enough.

Signed-off-by: Marvin Liu <yong.liu@intel.com>

diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c
index 92fab2174..0bca29855 100644
--- a/drivers/net/virtio/virtio_rxtx.c
+++ b/drivers/net/virtio/virtio_rxtx.c
@@ -47,6 +47,13 @@ virtio_dev_rx_queue_done(void *rxq, uint16_t offset)
 	return VIRTQUEUE_NUSED(vq) >= offset;
 }
 
+void
+vq_ring_free_inorder(struct virtqueue *vq, uint16_t desc_idx, uint16_t num)
+{
+	vq->vq_free_cnt += num;
+	vq->vq_desc_tail_idx = desc_idx & (vq->vq_nentries - 1);
+}
+
 void
 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
 {
diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
index 14364f356..26518ed98 100644
--- a/drivers/net/virtio/virtqueue.h
+++ b/drivers/net/virtio/virtqueue.h
@@ -306,6 +306,8 @@ virtio_get_queue_type(struct virtio_hw *hw, uint16_t vtpci_queue_idx)
 #define VIRTQUEUE_NUSED(vq) ((uint16_t)((vq)->vq_ring.used->idx - (vq)->vq_used_cons_idx))
 
 void vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx);
+void vq_ring_free_inorder(struct virtqueue *vq, uint16_t desc_idx,
+			  uint16_t num);
 
 static inline void
 vq_update_avail_idx(struct virtqueue *vq)
-- 
2.17.0