[dpdk-dev] [PATCH v6 04/11] net/virtio: flush packed receive virtqueues

[Jens Freimann <jfreimann@redhat.com>]

Flush used descriptors in packed receive virtqueue. As descriptors
can be chained we need to look at the stored number of used descriptors
to find out the length of the chain.

Signed-off-by: Jens Freimann <jfreimann@redhat.com>
---
 drivers/net/virtio/virtqueue.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/net/virtio/virtqueue.c b/drivers/net/virtio/virtqueue.c
index 56a77cc71..46dd9de52 100644
--- a/drivers/net/virtio/virtqueue.c
+++ b/drivers/net/virtio/virtqueue.c
@@ -58,12 +58,33 @@ virtqueue_detach_unused(struct virtqueue *vq)
 void
 virtqueue_rxvq_flush(struct virtqueue *vq)
 {
+	struct vring_desc_packed *descs = vq->vq_ring.desc_packed;
 	struct virtnet_rx *rxq = &vq->rxq;
 	struct virtio_hw *hw = vq->hw;
 	struct vring_used_elem *uep;
 	struct vq_desc_extra *dxp;
 	uint16_t used_idx, desc_idx;
 	uint16_t nb_used, i;
+	uint16_t size = vq->vq_nentries;
+
+	if (vtpci_packed_queue(vq->hw)) {
+		i = vq->vq_used_cons_idx;
+		if (i >= vq->vq_used_cons_idx) {
+			PMD_INIT_LOG(ERR, "vq_used_cons_idx out of range");
+			return;
+		}
+		while (desc_is_used(&descs[i], &vq->vq_ring) &&
+			i < vq->vq_nentries) {
+			dxp = &vq->vq_descx[i];
+			if (dxp->cookie != NULL)
+				rte_pktmbuf_free(dxp->cookie);
+			vq->vq_free_cnt += dxp->ndescs;
+			i = i + dxp->ndescs;
+			i = i >= size ? i - size : i;
+			dxp->ndescs = 0;
+		}
+		return;
+	}
 
 	nb_used = VIRTQUEUE_NUSED(vq);
 
-- 
2.17.1