netdev - [PATCH v9 19/25] net/mlx5e: TCP flow steering for nvme-tcp acceleration

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Message-Id: <20230117153535.1945554-20-aaptel@nvidia.com>
Date:   Tue, 17 Jan 2023 17:35:29 +0200
From:   Aurelien Aptel <aaptel@...dia.com>
To:     linux-nvme@...ts.infradead.org, netdev@...r.kernel.org,
        sagi@...mberg.me, hch@....de, kbusch@...nel.org, axboe@...com,
        chaitanyak@...dia.com, davem@...emloft.net, kuba@...nel.org
Cc:     Boris Pismenny <borisp@...dia.com>,
        Aurelien Aptel <aaptel@...dia.com>, aurelien.aptel@...il.com,
        smalin@...dia.com, malin1024@...il.com, ogerlitz@...dia.com,
        yorayz@...dia.com
Subject: [PATCH v9 19/25] 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>
---
 .../ethernet/mellanox/mlx5/core/en_accel/fs_tcp.c    | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

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 88a5aed9d678..29152d6e80d2 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 = kzalloc(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:
-- 
2.31.1