netdev - [PATCH v6 17/23] net/mlx5e: TCP flow steering for nvme-tcp acceleration

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Date:   Thu, 20 Oct 2022 13:18:32 +0300
From:   Aurelien Aptel <aaptel@...dia.com>
To:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        edumazet@...gle.com, pabeni@...hat.com, saeedm@...dia.com,
        tariqt@...dia.com, linux-nvme@...ts.infradead.org,
        sagi@...mberg.me, hch@....de, kbusch@...nel.org, axboe@...com,
        chaitanyak@...dia.com
Cc:     smalin@...dia.com, aaptel@...dia.com, ogerlitz@...dia.com,
        yorayz@...dia.com, borisp@...dia.com, aurelien.aptel@...il.com,
        malin1024@...il.com
Subject: [PATCH v6 17/23] net/mlx5e: TCP flow steering for nvme-tcp acceleration

From: Boris Pismenny <borisp@...dia.com>

Both nvme-tcp and tls acceleration require tcp flow steering.
Add reference counter to share TCP flow steering structure.

Signed-off-by: Boris Pismenny <borisp@...dia.com>
Signed-off-by: Ben Ben-Ishay <benishay@...dia.com>
Signed-off-by: Or Gerlitz <ogerlitz@...dia.com>
Signed-off-by: Yoray Zack <yorayz@...dia.com>
Signed-off-by: Aurelien Aptel <aaptel@...dia.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/fs.h      |  4 ++--
 .../ethernet/mellanox/mlx5/core/en_accel/fs_tcp.c    | 12 +++++++++++-
 .../ethernet/mellanox/mlx5/core/en_accel/fs_tcp.h    |  2 +-
 drivers/net/ethernet/mellanox/mlx5/core/en_fs.c      |  2 +-
 4 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/fs.h b/drivers/net/ethernet/mellanox/mlx5/core/en/fs.h
index bf2741eb7f9b..e4a121ae548e 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/fs.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/fs.h
@@ -77,7 +77,7 @@ enum {
 	MLX5E_INNER_TTC_FT_LEVEL,
 	MLX5E_FS_TT_UDP_FT_LEVEL = MLX5E_INNER_TTC_FT_LEVEL + 1,
 	MLX5E_FS_TT_ANY_FT_LEVEL = MLX5E_INNER_TTC_FT_LEVEL + 1,
-#ifdef CONFIG_MLX5_EN_TLS
+#if defined(CONFIG_MLX5_EN_TLS) || defined(CONFIG_MLX5_EN_NVMEOTCP)
 	MLX5E_ACCEL_FS_TCP_FT_LEVEL = MLX5E_INNER_TTC_FT_LEVEL + 1,
 #endif
 #ifdef CONFIG_MLX5_EN_ARFS
@@ -167,7 +167,7 @@ struct mlx5e_fs_any *mlx5e_fs_get_any(struct mlx5e_flow_steering *fs);
 void mlx5e_fs_set_any(struct mlx5e_flow_steering *fs, struct mlx5e_fs_any *any);
 struct mlx5e_fs_udp *mlx5e_fs_get_udp(struct mlx5e_flow_steering *fs);
 void mlx5e_fs_set_udp(struct mlx5e_flow_steering *fs, struct mlx5e_fs_udp *udp);
-#ifdef CONFIG_MLX5_EN_TLS
+#if defined(CONFIG_MLX5_EN_TLS) || defined(CONFIG_MLX5_EN_NVMEOTCP)
 struct mlx5e_accel_fs_tcp *mlx5e_fs_get_accel_tcp(struct mlx5e_flow_steering *fs);
 void mlx5e_fs_set_accel_tcp(struct mlx5e_flow_steering *fs, 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 285d32d2fd08..d0d213902bc4 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 user_count;
 };
 
 static enum mlx5_traffic_types fs_accel2tt(enum accel_fs_tcp_type i)
@@ -360,6 +361,9 @@ void mlx5e_accel_fs_tcp_destroy(struct mlx5e_flow_steering *fs)
 	if (!accel_tcp)
 		return;
 
+	if (!refcount_dec_and_test(&accel_tcp->user_count))
+		return;
+
 	accel_fs_tcp_disable(fs);
 
 	for (i = 0; i < ACCEL_FS_TCP_NUM_TYPES; i++)
@@ -371,12 +375,17 @@ void mlx5e_accel_fs_tcp_destroy(struct mlx5e_flow_steering *fs)
 
 int mlx5e_accel_fs_tcp_create(struct mlx5e_flow_steering *fs)
 {
-	struct mlx5e_accel_fs_tcp *accel_tcp;
+	struct mlx5e_accel_fs_tcp *accel_tcp = mlx5e_fs_get_accel_tcp(fs);
 	int i, err;
 
 	if (!MLX5_CAP_FLOWTABLE_NIC_RX(mlx5e_fs_get_mdev(fs), ft_field_support.outer_ip_version))
 		return -EOPNOTSUPP;
 
+	if (accel_tcp) {
+		refcount_inc(&accel_tcp->user_count);
+		return 0;
+	}
+
 	accel_tcp = kvzalloc(sizeof(*accel_tcp), GFP_KERNEL);
 	if (!accel_tcp)
 		return -ENOMEM;
@@ -392,6 +401,7 @@ int mlx5e_accel_fs_tcp_create(struct mlx5e_flow_steering *fs)
 	if (err)
 		goto err_destroy_tables;
 
+	refcount_set(&accel_tcp->user_count, 1);
 	return 0;
 
 err_destroy_tables:
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 a032bff482a6..d907e352ffae 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/fs.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_flow_steering *fs);
 void mlx5e_accel_fs_tcp_destroy(struct mlx5e_flow_steering *fs);
 struct mlx5_flow_handle *mlx5e_accel_fs_add_sk(struct mlx5e_flow_steering *fs,
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_fs.c b/drivers/net/ethernet/mellanox/mlx5/core/en_fs.c
index 1892ccb889b3..de8e37ccb777 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_fs.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_fs.c
@@ -61,7 +61,7 @@ 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
 	struct mlx5e_fs_udp            *udp;
-- 
2.31.1