net/mlx5: Add const to the key pointer of encryption key creation

Change key pointer to const void *, as there is no need to change the
key content. This is also to avoid modifying the key by mistake.

Signed-off-by: Jianbo Liu <jianbol@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls.c

@@ -13,8 +13,8 @@ int mlx5_ktls_create_key(struct mlx5_core_dev *mdev,
 			 struct tls_crypto_info *crypto_info,
 			 u32 *p_key_id)
 {
+	const void *key;
 	u32 sz_bytes;
-	void *key;
 
 	switch (crypto_info->cipher_type) {
 	case TLS_CIPHER_AES_GCM_128: {

drivers/net/ethernet/mellanox/mlx5/core/lib/crypto.c

@@ -10,7 +10,7 @@ struct mlx5_crypto_dek_priv {
 };
 
 int mlx5_create_encryption_key(struct mlx5_core_dev *mdev,
-			       void *key, u32 sz_bytes,
+			       const void *key, u32 sz_bytes,
 			       u32 key_type, u32 *p_key_id)
 {
 	u32 in[MLX5_ST_SZ_DW(create_encryption_key_in)] = {};

drivers/net/ethernet/mellanox/mlx5/core/lib/crypto.h

@@ -11,7 +11,7 @@ enum {
 };
 
 int mlx5_create_encryption_key(struct mlx5_core_dev *mdev,
-			       void *key, u32 sz_bytes,
+			       const void *key, u32 sz_bytes,
 			       u32 key_type, u32 *p_key_id);
 
 void mlx5_destroy_encryption_key(struct mlx5_core_dev *mdev, u32 key_id);