[dpdk-dev] [PATCH] net/mlx5: fix flow split combined with counter

[dpdk-dev] [PATCH] net/mlx5: fix flow split combined with counter

[Dekel Peled]

Currently, for a flow containing a count action, if flow is split to
sub-flows, a new counter will be created for each sub-flow.
However only the counter created for the last sub-flow will be queried
on flow query and cleared on flow removal.

This behavior is wrong, causing a leak of resources.
Need to create just one counter per flow, and use it for all sub-flows.

This patch adds the required check to make sure a counter is
created just once per flow, and used by all sub-flows.

Fixes: fa2d01c87d2b ("net/mlx5: support flow aging")
Cc: stable@dpdk.org

Signed-off-by: Dekel Peled <dekelp@nvidia.com>
---
 drivers/net/mlx5/mlx5_flow_dv.c | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index 11adc138f8..553f5e76bf 100644
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/drivers/net/mlx5/mlx5_flow_dv.c
@@ -10423,17 +10423,22 @@ flow_dv_translate(struct rte_eth_dev *dev,
 					handle->dvh.modify_hdr->action;
 			}
 			if (action_flags & MLX5_FLOW_ACTION_COUNT) {
-				flow->counter =
-					flow_dv_translate_create_counter(dev,
-						dev_flow, count, age);
-
-				if (!flow->counter)
-					return rte_flow_error_set
+				/*
+				 * Create one count action, to be used
+				 * by all sub-flows.
+				 */
+				if (!flow->counter) {
+					flow->counter =
+						flow_dv_translate_create_counter
+							(dev, dev_flow, count,
+							 age);
+					if (!flow->counter)
+						return rte_flow_error_set
 						(error, rte_errno,
-						RTE_FLOW_ERROR_TYPE_ACTION,
-						NULL,
-						"cannot create counter"
-						" object.");
+						 RTE_FLOW_ERROR_TYPE_ACTION,
+						 NULL, "cannot create counter"
+						 " object.");
+				}
 				dev_flow->dv.actions[actions_n] =
 					  (flow_dv_counter_get_by_idx(dev,
 					  flow->counter, NULL))->action;
-- 
2.25.1

Re: [dpdk-dev] [PATCH] net/mlx5: fix flow split combined with counter

[Matan Azrad]

From: Dekel Peled <dekelp@nvidia.com>
> Currently, for a flow containing a count action, if flow is split to sub-flows, a
> new counter will be created for each sub-flow.
> However only the counter created for the last sub-flow will be queried on flow
> query and cleared on flow removal.
> 
> This behavior is wrong, causing a leak of resources.
> Need to create just one counter per flow, and use it for all sub-flows.
> 
> This patch adds the required check to make sure a counter is created just once
> per flow, and used by all sub-flows.
> 
> Fixes: fa2d01c87d2b ("net/mlx5: support flow aging")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Dekel Peled <dekelp@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>

Re: [dpdk-dev] [PATCH] net/mlx5: fix flow split combined with counter

[Raslan Darawsheh]

Hi,

> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Dekel Peled
> Sent: Sunday, January 17, 2021 11:41 AM
> To: Matan Azrad <matan@nvidia.com>; Shahaf Shuler
> <shahafs@nvidia.com>; Slava Ovsiienko <viacheslavo@nvidia.com>
> Cc: dev@dpdk.org; stable@dpdk.org
> Subject: [dpdk-dev] [PATCH] net/mlx5: fix flow split combined with counter
> 
> Currently, for a flow containing a count action, if flow is split to
> sub-flows, a new counter will be created for each sub-flow.
> However only the counter created for the last sub-flow will be queried
> on flow query and cleared on flow removal.
> 
> This behavior is wrong, causing a leak of resources.
> Need to create just one counter per flow, and use it for all sub-flows.
> 
> This patch adds the required check to make sure a counter is
> created just once per flow, and used by all sub-flows.
> 
> Fixes: fa2d01c87d2b ("net/mlx5: support flow aging")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Dekel Peled <dekelp@nvidia.com>
> 
Patch applied to next-net-mlx,

Kindest regards,
Raslan Darawsheh