netdev - [PATCH v1 net-next 11/15] net/mlx5e: TCP flow steering for nvme-tcp

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Date:   Mon,  7 Dec 2020 23:06:45 +0200
From:   Boris Pismenny <borisp@...lanox.com>
To:     kuba@...nel.org, davem@...emloft.net, saeedm@...dia.com,
        hch@....de, sagi@...mberg.me, axboe@...com, kbusch@...nel.org,
        viro@...iv.linux.org.uk, edumazet@...gle.com
Cc:     boris.pismenny@...il.com, linux-nvme@...ts.infradead.org,
        netdev@...r.kernel.org, benishay@...dia.com, ogerlitz@...dia.com,
        yorayz@...dia.com, Ben Ben-Ishay <benishay@...lanox.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Yoray Zack <yorayz@...lanox.com>
Subject: [PATCH v1 net-next 11/15] net/mlx5e: TCP flow steering for nvme-tcp

Both nvme-tcp and tls require tcp flow steering. Compile it for both of
them. Additionally, use reference counting to allocate/free TCP flow
steering.

Signed-off-by: Boris Pismenny <borisp@...lanox.com>
Signed-off-by: Ben Ben-Ishay <benishay@...lanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@...lanox.com>
Signed-off-by: Yoray Zack <yorayz@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/fs.h        |  4 ++--
 .../net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.c  | 10 ++++++++++
 .../net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.h  |  2 +-
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/fs.h b/drivers/net/ethernet/mellanox/mlx5/core/en/fs.h
index a16297e7e2ac..a7fe3a6358ea 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/fs.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/fs.h
@@ -137,7 +137,7 @@ enum {
 	MLX5E_L2_FT_LEVEL,
 	MLX5E_TTC_FT_LEVEL,
 	MLX5E_INNER_TTC_FT_LEVEL,
-#ifdef CONFIG_MLX5_EN_TLS
+#if defined(CONFIG_MLX5_EN_TLS) || defined(CONFIG_MLX5_EN_NVMEOTCP)
 	MLX5E_ACCEL_FS_TCP_FT_LEVEL,
 #endif
 #ifdef CONFIG_MLX5_EN_ARFS
@@ -256,7 +256,7 @@ struct mlx5e_flow_steering {
 #ifdef CONFIG_MLX5_EN_ARFS
 	struct mlx5e_arfs_tables        arfs;
 #endif
-#ifdef CONFIG_MLX5_EN_TLS
+#if defined(CONFIG_MLX5_EN_TLS) || defined(CONFIG_MLX5_EN_NVMEOTCP)
 	struct mlx5e_accel_fs_tcp      *accel_tcp;
 #endif
 };
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.c
index 97f1594cee11..feded6c8cca1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.c
@@ -14,6 +14,7 @@ enum accel_fs_tcp_type {
 struct mlx5e_accel_fs_tcp {
 	struct mlx5e_flow_table tables[ACCEL_FS_TCP_NUM_TYPES];
 	struct mlx5_flow_handle *default_rules[ACCEL_FS_TCP_NUM_TYPES];
+	refcount_t		ref_count;
 };
 
 static enum mlx5e_traffic_types fs_accel2tt(enum accel_fs_tcp_type i)
@@ -335,6 +336,7 @@ static int accel_fs_tcp_enable(struct mlx5e_priv *priv)
 			return err;
 		}
 	}
+	refcount_set(&priv->fs.accel_tcp->ref_count, 1);
 	return 0;
 }
 
@@ -358,6 +360,9 @@ void mlx5e_accel_fs_tcp_destroy(struct mlx5e_priv *priv)
 	if (!priv->fs.accel_tcp)
 		return;
 
+	if (!refcount_dec_and_test(&priv->fs.accel_tcp->ref_count))
+		return;
+
 	accel_fs_tcp_disable(priv);
 
 	for (i = 0; i < ACCEL_FS_TCP_NUM_TYPES; i++)
@@ -374,6 +379,11 @@ int mlx5e_accel_fs_tcp_create(struct mlx5e_priv *priv)
 	if (!MLX5_CAP_FLOWTABLE_NIC_RX(priv->mdev, ft_field_support.outer_ip_version))
 		return -EOPNOTSUPP;
 
+	if (priv->fs.accel_tcp) {
+		refcount_inc(&priv->fs.accel_tcp->ref_count);
+		return 0;
+	}
+
 	priv->fs.accel_tcp = kzalloc(sizeof(*priv->fs.accel_tcp), GFP_KERNEL);
 	if (!priv->fs.accel_tcp)
 		return -ENOMEM;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.h b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.h
index 589235824543..8aff9298183c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.h
@@ -6,7 +6,7 @@
 
 #include "en.h"
 
-#ifdef CONFIG_MLX5_EN_TLS
+#if defined(CONFIG_MLX5_EN_TLS) || defined(CONFIG_MLX5_EN_NVMEOTCP)
 int mlx5e_accel_fs_tcp_create(struct mlx5e_priv *priv);
 void mlx5e_accel_fs_tcp_destroy(struct mlx5e_priv *priv);
 struct mlx5_flow_handle *mlx5e_accel_fs_add_sk(struct mlx5e_priv *priv,
-- 
2.24.1