Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) client-ip=2620:137:e000::1:18;
Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates
 12.22.5.236 as permitted sender) receiver=protection.outlook.com;
 client-ip=12.22.5.236; helo=mail.nvidia.com;
From:   Eli Cohen <elic@nvidia.com>
To:     <mst@redhat.com>, <jasowang@redhat.com>
CC:     <virtualization@lists.linux-foundation.org>,
        <linux-kernel@vger.kernel.org>, <si-wei.liu@oracle.com>,
        Eli Cohen <elic@nvidia.com>
Subject: [PATCH 1/3] vdpa/mlx5: Remove flow counter from steering
Date:   Mon, 11 Apr 2022 15:29:40 +0300
Message-ID: <20220411122942.225717-2-elic@nvidia.com>
In-Reply-To: <20220411122942.225717-1-elic@nvidia.com>
References: <20220411122942.225717-1-elic@nvidia.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Apr 2022 12:29:50.3114
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: a7e22bfe-969c-42c2-a7e3-08da1bb6f923
X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.236];Helo=[mail.nvidia.com]
X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT036.eop-nam11.prod.protection.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB2891
X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,
	DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,
	MAILING_LIST_MULTI,RDNS_NONE,SPF_HELO_NONE,T_SCC_BODY_TEXT_LINE
	autolearn=no autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
	lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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@nvidia.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