[PATCH v23 14/20] net/mlx5e: TCP flow steering for nvme-tcp acceleration

Aurelien Aptel
2024-02-28T12:59:59Z

From: Boris Pismenny <borisp@nvidia.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@nvidia.com>
Signed-off-by: Ben Ben-Ishay <benishay@nvidia.com>
Signed-off-by: Or Gerlitz <ogerlitz@nvidia.com>
Signed-off-by: Yoray Zack <yorayz@nvidia.com>
Signed-off-by: Aurelien Aptel <aaptel@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.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 c7d191f66ad1..82a9e2a4f58b 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)
@@ -361,6 +362,9 @@ 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++)
@@ -372,12 +376,17 @@ 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;
@@ -393,6 +402,7 @@ 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:
--
2.34.1