[PATCH] net/virtio: Implement {rxq,txq}_info_get callbacks

[Hengqi Chen <hengqi.chen@gmail.com>]

Currently, there are no ways to retrieve the queue size
set by vhost backend. Implement the {rxq,txq}_info_get
callbacks so that DPDK applications can use the queue
size to setup mempool properly.

Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
---
 drivers/net/virtio/virtio_ethdev.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 2d2635b669..b61d251814 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -616,6 +616,28 @@ virtio_dev_priv_dump(struct rte_eth_dev *dev, FILE *f)
 	return 0;
 }
 
+static void
+virtio_rxq_info_get(struct rte_eth_dev *dev, uint16_t rx_queue_id,
+		    struct rte_eth_rxq_info *qinfo)
+{
+	uint16_t vq_idx = 2 * rx_queue_id + VTNET_SQ_RQ_QUEUE_IDX;
+	struct virtio_hw *hw = dev->data->dev_private;
+	struct virtqueue *vq = hw->vqs[vq_idx];
+
+	qinfo->nb_desc = vq->vq_nentries;
+}
+
+static void
+virtio_txq_info_get(struct rte_eth_dev *dev, uint16_t tx_queue_id,
+		    struct rte_eth_txq_info *qinfo)
+{
+	uint16_t vq_idx = 2 * tx_queue_id + VTNET_SQ_TQ_QUEUE_IDX;
+	struct virtio_hw *hw = dev->data->dev_private;
+	struct virtqueue *vq = hw->vqs[vq_idx];
+
+	qinfo->nb_desc = vq->vq_nentries;
+}
+
 /*
  * dev_ops for virtio, bare necessities for basic operation
  */
@@ -630,6 +652,8 @@ static const struct eth_dev_ops virtio_eth_dev_ops = {
 	.allmulticast_disable    = virtio_dev_allmulticast_disable,
 	.mtu_set                 = virtio_mtu_set,
 	.dev_infos_get           = virtio_dev_info_get,
+	.rxq_info_get            = virtio_rxq_info_get,
+	.txq_info_get            = virtio_txq_info_get,
 	.stats_get               = virtio_dev_stats_get,
 	.xstats_get              = virtio_dev_xstats_get,
 	.xstats_get_names        = virtio_dev_xstats_get_names,
-- 
2.43.5