[dpdk-dev] [PATCH 2/4] net/mlx5: add reference counter for DV/DR structures

[Viacheslav Ovsiienko <viacheslavo@mellanox.com>]

This patch introduces the reference counter for DV/DR
flow engine structure, which we are going to share
between master and representors in E-Switch configurations
over multiport Infiniband device.

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
---
 drivers/net/mlx5/mlx5.c | 26 ++++++++++++++++++++++++--
 drivers/net/mlx5/mlx5.h |  4 ++++
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index 9de122d..79e0c17 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -299,7 +299,8 @@ struct mlx5_dev_spawn_data {
 #ifdef HAVE_MLX5DV_DR
 /**
  * Initialize DV/DR related data within private structure.
- * This is preparation step for the data sharing.
+ * Routine checks the reference counter and does actual
+ * resources creation/iniialization only if counter is zero.
  *
  * @param[in] priv
  *   Pointer to the private device data structure.
@@ -314,6 +315,14 @@ struct mlx5_dev_spawn_data {
 	int err = 0;
 	void *ns;
 
+	assert(sh);
+	if (sh->dv_refcnt) {
+		/* Shared DV/DR structures is already initialized. */
+		sh->dv_refcnt++;
+		priv->dv_shared = 1;
+		return 0;
+	}
+	/* Reference counter is zero, we should initialize structures. */
 	ns = mlx5dv_dr_create_ns(sh->ctx, MLX5DV_DR_NS_DOMAIN_INGRESS_BYPASS);
 	if (!ns) {
 		DRV_LOG(ERR, "ingress mlx5dv_dr_create_ns failed");
@@ -328,6 +337,8 @@ struct mlx5_dev_spawn_data {
 		goto error;
 	}
 	priv->tx_ns = ns;
+	sh->dv_refcnt++;
+	priv->dv_shared = 1;
 	return 0;
 
 error:
@@ -352,6 +363,16 @@ struct mlx5_dev_spawn_data {
 static void
 mlx5_free_shared_dv(struct mlx5_priv *priv)
 {
+	struct mlx5_ibv_shared *sh;
+
+	if (!priv->dv_shared)
+		return;
+	priv->dv_shared = 0;
+	sh = priv->sh;
+	assert(sh);
+	assert(sh->dv_refcnt);
+	if (sh->dv_refcnt && --sh->dv_refcnt)
+		return;
 	if (priv->rx_ns) {
 		mlx5dv_dr_destroy_ns(priv->rx_ns);
 		priv->rx_ns = NULL;
@@ -1491,7 +1512,8 @@ struct mlx5_dev_spawn_data {
 error:
 	if (priv) {
 #ifdef HAVE_MLX5DV_DR
-		mlx5_free_shared_dv(priv);
+		if (priv->sh)
+			mlx5_free_shared_dv(priv);
 #endif
 		if (priv->nl_socket_route >= 0)
 			close(priv->nl_socket_route);
diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index a3d5f8e..56a2c61 100644
--- a/drivers/net/mlx5/mlx5.h
+++ b/drivers/net/mlx5/mlx5.h
@@ -213,6 +213,9 @@ struct mlx5_ibv_shared {
 	char ibdev_name[IBV_SYSFS_NAME_MAX]; /* IB device name. */
 	char ibdev_path[IBV_SYSFS_PATH_MAX]; /* IB device path for secondary */
 	struct ibv_device_attr_ex device_attr; /* Device properties. */
+	/* Shared DV/DR flow data section. */
+	uint32_t dv_refcnt; /* DV/DR data reference counter. */
+	/* Shared interrupt handler section. */
 	pthread_mutex_t intr_mutex; /* Interrupt config mutex. */
 	uint32_t intr_cnt; /* Interrupt handler reference counter. */
 	struct rte_intr_handle intr_handle; /* Interrupt handler for device. */
@@ -244,6 +247,7 @@ struct mlx5_priv {
 	unsigned int isolated:1; /* Whether isolated mode is enabled. */
 	unsigned int representor:1; /* Device is a port representor. */
 	unsigned int master:1; /* Device is a E-Switch master. */
+	unsigned int dv_shared:1; /* DV/DR data is shared. */
 	uint16_t domain_id; /* Switch domain identifier. */
 	uint16_t vport_id; /* Associated VF vport index (if any). */
 	int32_t representor_id; /* Port representor identifier. */
-- 
1.8.3.1