linux-kernel - [PATCH 1/3] vdpa/mlx5: Remove flow counter from steering

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Message-ID: <20220411122942.225717-2-elic@nvidia.com>
Date:   Mon, 11 Apr 2022 15:29:40 +0300
From:   Eli Cohen <elic@...dia.com>
To:     <mst@...hat.com>, <jasowang@...hat.com>
CC:     <virtualization@...ts.linux-foundation.org>,
        <linux-kernel@...r.kernel.org>, <si-wei.liu@...cle.com>,
        Eli Cohen <elic@...dia.com>
Subject: [PATCH 1/3] vdpa/mlx5: Remove flow counter from steering

The flow counter has been introduced in early versions of the driver to
aid in debugging. It is no longer needed and can harm performance.

Remove it.

Signed-off-by: Eli Cohen <elic@...dia.com>
---
 drivers/vdpa/mlx5/net/mlx5_vnet.c | 24 ++++++------------------
 1 file changed, 6 insertions(+), 18 deletions(-)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index e0de44000d92..5aa6220c7129 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -156,7 +156,6 @@ struct mlx5_vdpa_net {
 	 */
 	struct mutex reslock;
 	struct mlx5_flow_table *rxft;
-	struct mlx5_fc *rx_counter;
 	struct mlx5_flow_handle *rx_rule_ucast;
 	struct mlx5_flow_handle *rx_rule_mcast;
 	bool setup;
@@ -1349,7 +1348,7 @@ static void destroy_tir(struct mlx5_vdpa_net *ndev)
 
 static int add_fwd_to_tir(struct mlx5_vdpa_net *ndev)
 {
-	struct mlx5_flow_destination dest[2] = {};
+	struct mlx5_flow_destination dest = {};
 	struct mlx5_flow_table_attr ft_attr = {};
 	struct mlx5_flow_act flow_act = {};
 	struct mlx5_flow_namespace *ns;
@@ -1381,12 +1380,6 @@ static int add_fwd_to_tir(struct mlx5_vdpa_net *ndev)
 		goto err_ns;
 	}
 
-	ndev->rx_counter = mlx5_fc_create(ndev->mvdev.mdev, false);
-	if (IS_ERR(ndev->rx_counter)) {
-		err = PTR_ERR(ndev->rx_counter);
-		goto err_fc;
-	}
-
 	headers_c = MLX5_ADDR_OF(fte_match_param, spec->match_criteria, outer_headers);
 	dmac_c = MLX5_ADDR_OF(fte_match_param, headers_c, outer_headers.dmac_47_16);
 	memset(dmac_c, 0xff, ETH_ALEN);
@@ -1394,12 +1387,10 @@ static int add_fwd_to_tir(struct mlx5_vdpa_net *ndev)
 	dmac_v = MLX5_ADDR_OF(fte_match_param, headers_v, outer_headers.dmac_47_16);
 	ether_addr_copy(dmac_v, ndev->config.mac);
 
-	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST | MLX5_FLOW_CONTEXT_ACTION_COUNT;
-	dest[0].type = MLX5_FLOW_DESTINATION_TYPE_TIR;
-	dest[0].tir_num = ndev->res.tirn;
-	dest[1].type = MLX5_FLOW_DESTINATION_TYPE_COUNTER;
-	dest[1].counter_id = mlx5_fc_id(ndev->rx_counter);
-	ndev->rx_rule_ucast = mlx5_add_flow_rules(ndev->rxft, spec, &flow_act, dest, 2);
+	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
+	dest.type = MLX5_FLOW_DESTINATION_TYPE_TIR;
+	dest.tir_num = ndev->res.tirn;
+	ndev->rx_rule_ucast = mlx5_add_flow_rules(ndev->rxft, spec, &flow_act, &dest, 1);
 
 	if (IS_ERR(ndev->rx_rule_ucast)) {
 		err = PTR_ERR(ndev->rx_rule_ucast);
@@ -1412,7 +1403,7 @@ static int add_fwd_to_tir(struct mlx5_vdpa_net *ndev)
 	dmac_c[0] = 1;
 	dmac_v[0] = 1;
 	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
-	ndev->rx_rule_mcast = mlx5_add_flow_rules(ndev->rxft, spec, &flow_act, dest, 1);
+	ndev->rx_rule_mcast = mlx5_add_flow_rules(ndev->rxft, spec, &flow_act, &dest, 1);
 	if (IS_ERR(ndev->rx_rule_mcast)) {
 		err = PTR_ERR(ndev->rx_rule_mcast);
 		ndev->rx_rule_mcast = NULL;
@@ -1426,8 +1417,6 @@ static int add_fwd_to_tir(struct mlx5_vdpa_net *ndev)
 	mlx5_del_flow_rules(ndev->rx_rule_ucast);
 	ndev->rx_rule_ucast = NULL;
 err_rule_ucast:
-	mlx5_fc_destroy(ndev->mvdev.mdev, ndev->rx_counter);
-err_fc:
 	mlx5_destroy_flow_table(ndev->rxft);
 err_ns:
 	kvfree(spec);
@@ -1443,7 +1432,6 @@ static void remove_fwd_to_tir(struct mlx5_vdpa_net *ndev)
 	ndev->rx_rule_mcast = NULL;
 	mlx5_del_flow_rules(ndev->rx_rule_ucast);
 	ndev->rx_rule_ucast = NULL;
-	mlx5_fc_destroy(ndev->mvdev.mdev, ndev->rx_counter);
 	mlx5_destroy_flow_table(ndev->rxft);
 }
 
-- 
2.35.1