net/mlx5: Add crypto library to support create/destroy encryption key

Encryption key create / destroy is done via
CREATE_GENERAL_OBJECT / DESTROY_GENERAL_OBJECT commands.

To be used in downstream patches by TLS API wrappers, to configure
the TIS context with the encryption key.
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx5/core/Makefile

@@ -55,7 +55,7 @@ mlx5_core-$(CONFIG_MLX5_CORE_IPOIB) += ipoib/ipoib.o ipoib/ethtool.o ipoib/ipoib
 #
 mlx5_core-$(CONFIG_MLX5_FPGA_IPSEC) += fpga/ipsec.o
 mlx5_core-$(CONFIG_MLX5_FPGA_TLS)   += fpga/tls.o
-mlx5_core-$(CONFIG_MLX5_ACCEL)      += accel/tls.o accel/ipsec.o
+mlx5_core-$(CONFIG_MLX5_ACCEL)      += lib/crypto.o accel/tls.o accel/ipsec.o
 
 mlx5_core-$(CONFIG_MLX5_FPGA) += fpga/cmd.o fpga/core.o fpga/conn.o fpga/sdk.o
 

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

+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+// Copyright (c) 2019 Mellanox Technologies.
+
+#include "mlx5_core.h"
+
+int mlx5_create_encryption_key(struct mlx5_core_dev *mdev,
+			       void *key, u32 sz_bytes,
+			       u32 *p_key_id)
+{
+	u32 in[MLX5_ST_SZ_DW(create_encryption_key_in)] = {};
+	u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)];
+	u32 sz_bits = sz_bytes * BITS_PER_BYTE;
+	u8  general_obj_key_size;
+	u64 general_obj_types;
+	void *obj, *key_p;
+	int err;
+
+	obj = MLX5_ADDR_OF(create_encryption_key_in, in, encryption_key_object);
+	key_p = MLX5_ADDR_OF(encryption_key_obj, obj, key);
+
+	general_obj_types = MLX5_CAP_GEN_64(mdev, general_obj_types);
+	if (!(general_obj_types &
+	      MLX5_HCA_CAP_GENERAL_OBJECT_TYPES_ENCRYPTION_KEY))
+		return -EINVAL;
+
+	switch (sz_bits) {
+	case 128:
+		general_obj_key_size =
+			MLX5_GENERAL_OBJECT_TYPE_ENCRYPTION_KEY_KEY_SIZE_128;
+		break;
+	case 256:
+		general_obj_key_size =
+			MLX5_GENERAL_OBJECT_TYPE_ENCRYPTION_KEY_KEY_SIZE_256;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	memcpy(key_p, key, sz_bytes);
+
+	MLX5_SET(encryption_key_obj, obj, key_size, general_obj_key_size);
+	MLX5_SET(encryption_key_obj, obj, key_type,
+		 MLX5_GENERAL_OBJECT_TYPE_ENCRYPTION_KEY_TYPE_DEK);
+	MLX5_SET(general_obj_in_cmd_hdr, in, opcode,
+		 MLX5_CMD_OP_CREATE_GENERAL_OBJECT);
+	MLX5_SET(general_obj_in_cmd_hdr, in, obj_type,
+		 MLX5_GENERAL_OBJECT_TYPES_ENCRYPTION_KEY);
+	MLX5_SET(encryption_key_obj, obj, pd, mdev->mlx5e_res.pdn);
+
+	err = mlx5_cmd_exec(mdev, in, sizeof(in), out, sizeof(out));
+	if (!err)
+		*p_key_id = MLX5_GET(general_obj_out_cmd_hdr, out, obj_id);
+
+	/* avoid leaking key on the stack */
+	memzero_explicit(in, sizeof(in));
+
+	return err;
+}
+
+void mlx5_destroy_encryption_key(struct mlx5_core_dev *mdev, u32 key_id)
+{
+	u32 in[MLX5_ST_SZ_DW(general_obj_in_cmd_hdr)] = {};
+	u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)];
+
+	MLX5_SET(general_obj_in_cmd_hdr, in, opcode,
+		 MLX5_CMD_OP_DESTROY_GENERAL_OBJECT);
+	MLX5_SET(general_obj_in_cmd_hdr, in, obj_type,
+		 MLX5_GENERAL_OBJECT_TYPES_ENCRYPTION_KEY);
+	MLX5_SET(general_obj_in_cmd_hdr, in, obj_id, key_id);
+
+	mlx5_cmd_exec(mdev, in, sizeof(in), out, sizeof(out));
+}

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

@@ -79,4 +79,9 @@ struct mlx5_pme_stats {
 void mlx5_get_pme_stats(struct mlx5_core_dev *dev, struct mlx5_pme_stats *stats);
 int mlx5_notifier_call_chain(struct mlx5_events *events, unsigned int event, void *data);
 
+/* Crypto */
+int mlx5_create_encryption_key(struct mlx5_core_dev *mdev,
+			       void *key, u32 sz_bytes, u32 *p_key_id);
+void mlx5_destroy_encryption_key(struct mlx5_core_dev *mdev, u32 key_id);
+
 #endif