[dpdk-dev] [PATCH 2/3] vdpa/mlx5: separate virtq stop

[Matan Azrad]

In live migration, before logging the virtq, the driver queries the
virtq indexes after moving it to suspend mode.

Separate this method to new function mlx5_vdpa_virtq_stop as a
preparation for reusing.

Signed-off-by: Matan Azrad <matan at mellanox.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo at mellanox.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>
---
 drivers/vdpa/mlx5/mlx5_vdpa.h       | 13 +++++++++++++
 drivers/vdpa/mlx5/mlx5_vdpa_lm.c    | 17 ++---------------
 drivers/vdpa/mlx5/mlx5_vdpa_virtq.c | 26 ++++++++++++++++++++++++++
 3 files changed, 41 insertions(+), 15 deletions(-)

diff --git a/drivers/vdpa/mlx5/mlx5_vdpa.h b/drivers/vdpa/mlx5/mlx5_vdpa.h
index baec106..0edd688 100644
--- a/drivers/vdpa/mlx5/mlx5_vdpa.h
+++ b/drivers/vdpa/mlx5/mlx5_vdpa.h
@@ -308,4 +308,17 @@ int mlx5_vdpa_dirty_bitmap_set(struct mlx5_vdpa_priv *priv, uint64_t log_base,
  */
 int mlx5_vdpa_virtq_modify(struct mlx5_vdpa_virtq *virtq, int state);
 
+/**
+ * Stop virtq before destroying it.
+ *
+ * @param[in] priv
+ *   The vdpa driver private structure.
+ * @param[in] index
+ *   The virtq index.
+ *
+ * @return
+ *   0 on success, a negative value otherwise.
+ */
+int mlx5_vdpa_virtq_stop(struct mlx5_vdpa_priv *priv, int index);
+
 #endif /* RTE_PMD_MLX5_VDPA_H_ */
diff --git a/drivers/vdpa/mlx5/mlx5_vdpa_lm.c b/drivers/vdpa/mlx5/mlx5_vdpa_lm.c
index 77f2eda..26b7ce1 100644
--- a/drivers/vdpa/mlx5/mlx5_vdpa_lm.c
+++ b/drivers/vdpa/mlx5/mlx5_vdpa_lm.c
@@ -91,7 +91,6 @@
 int
 mlx5_vdpa_lm_log(struct mlx5_vdpa_priv *priv)
 {
-	struct mlx5_devx_virtq_attr attr = {0};
 	uint64_t features;
 	int ret = rte_vhost_get_negotiated_features(priv->vid, &features);
 	int i;
@@ -103,21 +102,9 @@
 	if (!RTE_VHOST_NEED_LOG(features))
 		return 0;
 	for (i = 0; i < priv->nr_virtqs; ++i) {
-		ret = mlx5_vdpa_virtq_modify(&priv->virtqs[i], 0);
-		if (ret)
-			return -1;
-		if (mlx5_devx_cmd_query_virtq(priv->virtqs[i].virtq, &attr)) {
-			DRV_LOG(ERR, "Failed to query virtq %d.", i);
-			return -1;
-		}
-		DRV_LOG(INFO, "Query vid %d vring %d: hw_available_idx=%d, "
-			"hw_used_index=%d", priv->vid, i,
-			attr.hw_available_index, attr.hw_used_index);
-		ret = rte_vhost_set_vring_base(priv->vid, i,
-					       attr.hw_available_index,
-					       attr.hw_used_index);
+		ret = mlx5_vdpa_virtq_stop(priv, i);
 		if (ret) {
-			DRV_LOG(ERR, "Failed to set virtq %d base.", i);
+			DRV_LOG(ERR, "Failed to stop virtq %d.", i);
 			return -1;
 		}
 		rte_vhost_log_used_vring(priv->vid, i, 0,
diff --git a/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c b/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c
index e07c826..9c0284c 100644
--- a/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c
+++ b/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c
@@ -112,6 +112,32 @@
 	return mlx5_devx_cmd_modify_virtq(virtq->virtq, &attr);
 }
 
+int
+mlx5_vdpa_virtq_stop(struct mlx5_vdpa_priv *priv, int index)
+{
+	struct mlx5_devx_virtq_attr attr = {0};
+	struct mlx5_vdpa_virtq *virtq = &priv->virtqs[index];
+	int ret = mlx5_vdpa_virtq_modify(virtq, 0);
+
+	if (ret)
+		return -1;
+	if (mlx5_devx_cmd_query_virtq(virtq->virtq, &attr)) {
+		DRV_LOG(ERR, "Failed to query virtq %d.", index);
+		return -1;
+	}
+	DRV_LOG(INFO, "Query vid %d vring %d: hw_available_idx=%d, "
+		"hw_used_index=%d", priv->vid, index,
+		attr.hw_available_index, attr.hw_used_index);
+	ret = rte_vhost_set_vring_base(priv->vid, index,
+				       attr.hw_available_index,
+				       attr.hw_used_index);
+	if (ret) {
+		DRV_LOG(ERR, "Failed to set virtq %d base.", index);
+		return -1;
+	}
+	return 0;
+}
+
 static uint64_t
 mlx5_vdpa_hva_to_gpa(struct rte_vhost_memory *mem, uint64_t hva)
 {
-- 
1.8.3.1