vhost: fix vector filling for packed ring

We should return the length of the buffers described by
the current descriptor chain after filling the buffer
vector. So we need to zero the *len first.

Fixes: 2f3225a7d69b ("vhost: add vector filling support for packed ring")
Cc: stable@dpdk.org
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index f8794ee..1c31c05 100644 (file)
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -521,6 +521,7 @@ fill_vec_buf_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
                return -1;
 
        *desc_count = 0;
+       *len = 0;
 
        while (1) {
                if (unlikely(vec_id >= BUF_VECTOR_MAX))