[PATCH 20.11] vdpa/mlx5: fix maximum number of virtqs

[Li Zhang]

[ upstream commit 6f065d1539bed56602e3c6159c99cccb3bca38e4 ]

The driver wrongly takes the capability value for
the number of virtq pairs instead of just the number of virtqs.

Adjust all the usages of it to be the number of virtqs.

Fixes: c2eb33aaf967 ("vdpa/mlx5: manage virtqs by array")
Cc: stable at dpdk.org

Signed-off-by: Li Zhang <lizh at nvidia.com>
Acked-by: Matan Azrad <matan at nvidia.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>
---
 drivers/vdpa/mlx5/mlx5_vdpa.c       | 6 +++---
 drivers/vdpa/mlx5/mlx5_vdpa_virtq.c | 4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/vdpa/mlx5/mlx5_vdpa.c b/drivers/vdpa/mlx5/mlx5_vdpa.c
index 6519b9c9a..65a1edc33 100644
--- a/drivers/vdpa/mlx5/mlx5_vdpa.c
+++ b/drivers/vdpa/mlx5/mlx5_vdpa.c
@@ -82,7 +82,7 @@ mlx5_vdpa_get_queue_num(struct rte_vdpa_device *vdev, uint32_t *queue_num)
 		DRV_LOG(ERR, "Invalid vDPA device: %s.", vdev->device->name);
 		return -1;
 	}
-	*queue_num = priv->caps.max_num_virtio_queues;
+	*queue_num = priv->caps.max_num_virtio_queues / 2;
 	return 0;
 }
 
@@ -139,7 +139,7 @@ mlx5_vdpa_set_vring_state(int vid, int vring, int state)
 		DRV_LOG(ERR, "Invalid vDPA device: %s.", vdev->device->name);
 		return -EINVAL;
 	}
-	if (vring >= (int)priv->caps.max_num_virtio_queues * 2) {
+	if (vring >= (int)priv->caps.max_num_virtio_queues) {
 		DRV_LOG(ERR, "Too big vring id: %d.", vring);
 		return -E2BIG;
 	}
@@ -726,7 +726,7 @@ mlx5_vdpa_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
 		DRV_LOG(DEBUG, "No capability to support virtq statistics.");
 	priv = rte_zmalloc("mlx5 vDPA device private", sizeof(*priv) +
 			   sizeof(struct mlx5_vdpa_virtq) *
-			   attr.vdpa.max_num_virtio_queues * 2,
+			   attr.vdpa.max_num_virtio_queues,
 			   RTE_CACHE_LINE_SIZE);
 	if (!priv) {
 		DRV_LOG(ERR, "Failed to allocate private memory.");
diff --git a/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c b/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c
index 0d31e1d95..a1ae02292 100644
--- a/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c
+++ b/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c
@@ -450,9 +450,9 @@ mlx5_vdpa_virtqs_prepare(struct mlx5_vdpa_priv *priv)
 		DRV_LOG(INFO, "TSO is enabled without CSUM, force CSUM.");
 		priv->features |= (1ULL << VIRTIO_NET_F_CSUM);
 	}
-	if (nr_vring > priv->caps.max_num_virtio_queues * 2) {
+	if (nr_vring > priv->caps.max_num_virtio_queues) {
 		DRV_LOG(ERR, "Do not support more than %d virtqs(%d).",
-			(int)priv->caps.max_num_virtio_queues * 2,
+			(int)priv->caps.max_num_virtio_queues,
 			(int)nr_vring);
 		return -1;
 	}
-- 
2.30.2