commit 470acd1b108f20ae12b1216c9f6157b78655bcc7
Author: Jianfeng Tan <henry.tjf@antfin.com>
Date:   Wed Dec 12 02:14:03 2018 +0000

    net/virtio: fill desc limit
    
    We shall fill desc limit accordingly, or APIs, such as
    rte_eth_dev_adjust_nb_rx_tx_desc, will not give correct desc
    information.
    
    Signed-off-by: Jianfeng Tan <henry.tjf@antfin.com>

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index dbfa6865c..d369d5ce8 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -2172,6 +2172,7 @@ virtio_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 {
 	uint64_t tso_mask, host_features;
 	struct virtio_hw *hw = dev->data->dev_private;
+	struct virtqueue *vq;
 
 	dev_info->speed_capa = ETH_LINK_SPEED_10G; /* fake value */
 
@@ -2209,6 +2210,17 @@ virtio_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 		(1ULL << VIRTIO_NET_F_HOST_TSO6);
 	if ((host_features & tso_mask) == tso_mask)
 		dev_info->tx_offload_capa |= DEV_TX_OFFLOAD_TCP_TSO;
+
+
+	if (hw->vqs) {
+		vq = hw->vqs[VTNET_SQ_RQ_QUEUE_IDX];
+		dev_info->rx_desc_lim.nb_max = vq->vq_nentries;
+		dev_info->rx_desc_lim.nb_min = 256;
+
+		vq = hw->vqs[VTNET_SQ_TQ_QUEUE_IDX];
+		dev_info->tx_desc_lim.nb_max = vq->vq_nentries;
+		dev_info->tx_desc_lim.nb_min = 256;
+	}
 }
 
 /*