[PATCH] net/mlx5: fix the leak of action data list

[PATCH] net/mlx5: fix the leak of action data list

[Bing Zhao]

In the actions construction of NT2HWS, the `masks` parameter is
always set to NULL and all the actions will be translated in the
"construct" stage as non-fixed ones.

In the stage of translating actions template, the actions data would
be allocated from the pool and managed in a list. The list would be
released when destroying the template with the actions. In the NT2HWS
implementation, the temporary template was freed directly and the
actions will be destroyed with the flow rule deletion. No other rule
would use this list anymore.

The actions data in the list should be freed when the actions
construction is done.

Fixes: ff4064d5b1fe ("net/mlx5: support bulk actions in non-template flow")
Cc: mkashani@nvidia.com

Signed-off-by: Bing Zhao <bingz@nvidia.com>
---
 drivers/net/mlx5/mlx5_flow_hw.c | 63 ++++++++++++++++++++-------------
 1 file changed, 39 insertions(+), 24 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow_hw.c b/drivers/net/mlx5/mlx5_flow_hw.c
index 50dbaa27ab..7233ac46c4 100644
--- a/drivers/net/mlx5/mlx5_flow_hw.c
+++ b/drivers/net/mlx5/mlx5_flow_hw.c
@@ -966,18 +966,15 @@ __flow_hw_actions_release(struct rte_eth_dev *dev, struct mlx5_hw_actions *acts)
 }
 
 /**
- * Destroy DR actions created by action template.
- *
- * For DR actions created during table creation's action translate.
- * Need to destroy the DR action when destroying the table.
+ * Release the action data back into the pool without destory any action.
  *
  * @param[in] dev
  *   Pointer to the rte_eth_dev structure.
  * @param[in] acts
  *   Pointer to the template HW steering DR actions.
  */
-static void
-__flow_hw_action_template_destroy(struct rte_eth_dev *dev, struct mlx5_hw_actions *acts)
+static inline void
+__flow_hw_act_data_flush(struct rte_eth_dev *dev, struct mlx5_hw_actions *acts)
 {
 	struct mlx5_priv *priv = dev->data->dev_private;
 	struct mlx5_action_construct_data *data;
@@ -987,7 +984,23 @@ __flow_hw_action_template_destroy(struct rte_eth_dev *dev, struct mlx5_hw_action
 		LIST_REMOVE(data, next);
 		mlx5_ipool_free(priv->acts_ipool, data->idx);
 	}
+}
 
+/*
+ * Destroy DR actions created by action template.
+ *
+ * For DR actions created during table creation's action translate.
+ * Need to destroy the DR action when destroying the table.
+ *
+ * @param[in] dev
+ *   Pointer to the rte_eth_dev structure.
+ * @param[in] acts
+ *   Pointer to the template HW steering DR actions.
+ */
+static void
+__flow_hw_action_template_destroy(struct rte_eth_dev *dev, struct mlx5_hw_actions *acts)
+{
+	__flow_hw_act_data_flush(dev, acts);
 	__flow_hw_actions_release(dev, acts);
 }
 
@@ -13492,14 +13505,14 @@ flow_nta_build_template_mask(const struct rte_flow_action actions[],
 
 static int
 flow_hw_translate_flow_actions(struct rte_eth_dev *dev,
-			  const struct rte_flow_attr *attr,
-			  const struct rte_flow_action actions[],
-			  struct rte_flow_hw *flow,
-			  struct mlx5_flow_hw_action_params *ap,
-			  struct mlx5_hw_actions *hw_acts,
-			  uint64_t item_flags, uint64_t action_flags,
-			  bool external,
-			  struct rte_flow_error *error)
+			       const struct rte_flow_attr *attr,
+			       const struct rte_flow_action actions[],
+			       struct rte_flow_hw *flow,
+			       struct mlx5_flow_hw_action_params *ap,
+			       struct mlx5_hw_actions *hw_acts,
+			       uint64_t item_flags, uint64_t action_flags,
+			       bool external,
+			       struct rte_flow_error *error)
 {
 	int ret = 0;
 	uint32_t src_group = 0;
@@ -13542,7 +13555,7 @@ flow_hw_translate_flow_actions(struct rte_eth_dev *dev,
 	table = mlx5_malloc(MLX5_MEM_ZERO, sizeof(*table), 0, SOCKET_ID_ANY);
 	if (!table)
 		return rte_flow_error_set(error, ENOMEM, RTE_FLOW_ERROR_TYPE_ACTION,
-				   actions, "Failed to allocate dummy table");
+					  actions, "Failed to allocate dummy table");
 	at = __flow_hw_actions_template_create(dev, &template_attr, actions, masks, true, error);
 	if (!at) {
 		ret = -rte_errno;
@@ -13556,27 +13569,29 @@ flow_hw_translate_flow_actions(struct rte_eth_dev *dev,
 	memcpy(&table->cfg.attr.flow_attr, attr, sizeof(*attr));
 	table->ats[0].action_template = at;
 	ret = __flow_hw_translate_actions_template(dev, &table->cfg, hw_acts, at,
-		&table->mpctx, true, error);
+						   &table->mpctx, true, error);
 	if (ret)
 		goto end;
 	/* handle bulk actions register. */
 	ret = flow_hw_encap_decap_resource_register(dev, table, hw_acts, flow, error);
 	if (ret)
-		goto clean_up;
+		goto end;
 	ret = flow_hw_modify_hdr_resource_register(dev, table, hw_acts, flow, error);
 	if (ret)
-		goto clean_up;
+		goto end;
 	table->ats[0].acts = *hw_acts;
 	ret = flow_hw_actions_construct(dev, flow, ap,
-		&table->ats[0], item_flags, table,
-		actions, hw_acts->rule_acts, 0, error);
+					&table->ats[0], item_flags, table,
+					actions, hw_acts->rule_acts, 0, error);
 	if (ret)
-		goto clean_up;
+		goto end;
 	goto end;
-clean_up:
-	/* Make sure that there is no garbage in the actions. */
-	__flow_hw_action_template_destroy(dev, hw_acts);
 end:
+	if (ret)
+		/* Make sure that there is no garbage in the actions. */
+		__flow_hw_action_template_destroy(dev, hw_acts);
+	else
+		__flow_hw_act_data_flush(dev, hw_acts);
 	if (table)
 		mlx5_free(table);
 	if (at)
-- 
2.34.1

RE: [PATCH] net/mlx5: fix the leak of action data list

[Dariusz Sosnowski]

Hi,

> -----Original Message-----
> From: Bing Zhao <bingz@nvidia.com>
> Sent: Monday, November 18, 2024 07:53
> To: Dariusz Sosnowski <dsosnowski@nvidia.com>; Slava Ovsiienko
> <viacheslavo@nvidia.com>; dev@dpdk.org; Raslan Darawsheh
> <rasland@nvidia.com>
> Cc: Ori Kam <orika@nvidia.com>; Suanming Mou <suanmingm@nvidia.com>;
> Matan Azrad <matan@nvidia.com>; Maayan Kashani
> <mkashani@nvidia.com>
> Subject: [PATCH] net/mlx5: fix the leak of action data list
> 
> In the actions construction of NT2HWS, the `masks` parameter is always set to
> NULL and all the actions will be translated in the "construct" stage as non-fixed
> ones.

Please replace NT2HWS in commit message with "non-template flow API".

> 
> In the stage of translating actions template, the actions data would be
> allocated from the pool and managed in a list. The list would be released when
> destroying the template with the actions. In the NT2HWS implementation, the
> temporary template was freed directly and the actions will be destroyed with
> the flow rule deletion. No other rule would use this list anymore.
> 
> The actions data in the list should be freed when the actions construction is
> done.
> 
> Fixes: ff4064d5b1fe ("net/mlx5: support bulk actions in non-template flow")
> Cc: mkashani@nvidia.com
> 
> Signed-off-by: Bing Zhao <bingz@nvidia.com>
> ---
>  drivers/net/mlx5/mlx5_flow_hw.c | 63 ++++++++++++++++++++-------------
>  1 file changed, 39 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/net/mlx5/mlx5_flow_hw.c
> b/drivers/net/mlx5/mlx5_flow_hw.c index 50dbaa27ab..7233ac46c4 100644
> --- a/drivers/net/mlx5/mlx5_flow_hw.c
> +++ b/drivers/net/mlx5/mlx5_flow_hw.c
> @@ -966,18 +966,15 @@ __flow_hw_actions_release(struct rte_eth_dev
> *dev, struct mlx5_hw_actions *acts)  }
> 
>  /**
> - * Destroy DR actions created by action template.
> - *
> - * For DR actions created during table creation's action translate.
> - * Need to destroy the DR action when destroying the table.
> + * Release the action data back into the pool without destory any action.
>   *
>   * @param[in] dev
>   *   Pointer to the rte_eth_dev structure.
>   * @param[in] acts
>   *   Pointer to the template HW steering DR actions.
>   */
> -static void
> -__flow_hw_action_template_destroy(struct rte_eth_dev *dev, struct
> mlx5_hw_actions *acts)
> +static inline void
> +__flow_hw_act_data_flush(struct rte_eth_dev *dev, struct
> +mlx5_hw_actions *acts)
>  {
>  	struct mlx5_priv *priv = dev->data->dev_private;
>  	struct mlx5_action_construct_data *data; @@ -987,7 +984,23 @@
> __flow_hw_action_template_destroy(struct rte_eth_dev *dev, struct
> mlx5_hw_action
>  		LIST_REMOVE(data, next);
>  		mlx5_ipool_free(priv->acts_ipool, data->idx);
>  	}
> +}
> 
> +/*
> + * Destroy DR actions created by action template.
> + *
> + * For DR actions created during table creation's action translate.
> + * Need to destroy the DR action when destroying the table.
> + *
> + * @param[in] dev
> + *   Pointer to the rte_eth_dev structure.
> + * @param[in] acts
> + *   Pointer to the template HW steering DR actions.
> + */
> +static void
> +__flow_hw_action_template_destroy(struct rte_eth_dev *dev, struct
> +mlx5_hw_actions *acts) {
> +	__flow_hw_act_data_flush(dev, acts);
>  	__flow_hw_actions_release(dev, acts);
>  }
> 
> @@ -13492,14 +13505,14 @@ flow_nta_build_template_mask(const struct
> rte_flow_action actions[],
> 
>  static int
>  flow_hw_translate_flow_actions(struct rte_eth_dev *dev,
> -			  const struct rte_flow_attr *attr,
> -			  const struct rte_flow_action actions[],
> -			  struct rte_flow_hw *flow,
> -			  struct mlx5_flow_hw_action_params *ap,
> -			  struct mlx5_hw_actions *hw_acts,
> -			  uint64_t item_flags, uint64_t action_flags,
> -			  bool external,
> -			  struct rte_flow_error *error)
> +			       const struct rte_flow_attr *attr,
> +			       const struct rte_flow_action actions[],
> +			       struct rte_flow_hw *flow,
> +			       struct mlx5_flow_hw_action_params *ap,
> +			       struct mlx5_hw_actions *hw_acts,
> +			       uint64_t item_flags, uint64_t action_flags,
> +			       bool external,
> +			       struct rte_flow_error *error)
>  {
>  	int ret = 0;
>  	uint32_t src_group = 0;
> @@ -13542,7 +13555,7 @@ flow_hw_translate_flow_actions(struct
> rte_eth_dev *dev,
>  	table = mlx5_malloc(MLX5_MEM_ZERO, sizeof(*table), 0,
> SOCKET_ID_ANY);
>  	if (!table)
>  		return rte_flow_error_set(error, ENOMEM,
> RTE_FLOW_ERROR_TYPE_ACTION,
> -				   actions, "Failed to allocate dummy
> table");
> +					  actions, "Failed to allocate
> dummy table");
>  	at = __flow_hw_actions_template_create(dev, &template_attr,
> actions, masks, true, error);
>  	if (!at) {
>  		ret = -rte_errno;
> @@ -13556,27 +13569,29 @@ flow_hw_translate_flow_actions(struct
> rte_eth_dev *dev,
>  	memcpy(&table->cfg.attr.flow_attr, attr, sizeof(*attr));
>  	table->ats[0].action_template = at;
>  	ret = __flow_hw_translate_actions_template(dev, &table->cfg,
> hw_acts, at,
> -		&table->mpctx, true, error);
> +						   &table->mpctx, true,
> error);
>  	if (ret)
>  		goto end;
>  	/* handle bulk actions register. */
>  	ret = flow_hw_encap_decap_resource_register(dev, table, hw_acts,
> flow, error);
>  	if (ret)
> -		goto clean_up;
> +		goto end;
>  	ret = flow_hw_modify_hdr_resource_register(dev, table, hw_acts,
> flow, error);
>  	if (ret)
> -		goto clean_up;
> +		goto end;
>  	table->ats[0].acts = *hw_acts;
>  	ret = flow_hw_actions_construct(dev, flow, ap,
> -		&table->ats[0], item_flags, table,
> -		actions, hw_acts->rule_acts, 0, error);
> +					&table->ats[0], item_flags, table,
> +					actions, hw_acts->rule_acts, 0,
> error);
>  	if (ret)
> -		goto clean_up;
> +		goto end;
>  	goto end;
> -clean_up:
> -	/* Make sure that there is no garbage in the actions. */
> -	__flow_hw_action_template_destroy(dev, hw_acts);
>  end:
> +	if (ret)
> +		/* Make sure that there is no garbage in the actions. */
> +		__flow_hw_action_template_destroy(dev, hw_acts);
> +	else
> +		__flow_hw_act_data_flush(dev, hw_acts);
>  	if (table)
>  		mlx5_free(table);
>  	if (at)
> --
> 2.34.1

Best regards,
Dariusz Sosnowski