/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 2017-2019 Mellanox Technologies.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of Mellanox nor the names of contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef _MLXFW_MFA2_TLV_H
#define _MLXFW_MFA2_TLV_H

#include <linux/kernel.h>
#include "mlxfw_mfa2_file.h"

struct mlxfw_mfa2_tlv {
	u8 version;
	u8 type;
	__be16 len;
	u8 data[0];
} __packed;

static inline const struct mlxfw_mfa2_tlv *
mlxfw_mfa2_tlv_get(const struct mlxfw_mfa2_file *mfa2_file, const u8 *ptr)
{
	if (!mlxfw_mfa2_valid_ptr(mfa2_file, ptr) ||
	    !mlxfw_mfa2_valid_ptr(mfa2_file, ptr + sizeof(struct mlxfw_mfa2_tlv)))
		return NULL;
	return (const struct mlxfw_mfa2_tlv *) ptr;
}

static inline const void *
mlxfw_mfa2_tlv_payload_get(const struct mlxfw_mfa2_file *mfa2_file,
			   const struct mlxfw_mfa2_tlv *tlv, u8 payload_type,
			   size_t payload_size, bool varsize)
{
	const u8 *tlv_top;

	tlv_top = (const u8 *) tlv + be16_to_cpu(tlv->len) - 1;
	if (!mlxfw_mfa2_valid_ptr(mfa2_file, (const u8 *) tlv) ||
	    !mlxfw_mfa2_valid_ptr(mfa2_file, tlv_top))
		return NULL;
	if (tlv->type != payload_type)
		return NULL;
	if (varsize && (be16_to_cpu(tlv->len) < payload_size))
		return NULL;
	if (!varsize && (be16_to_cpu(tlv->len) != payload_size))
		return NULL;

	return tlv->data;
}

#define MLXFW_MFA2_TLV(name, payload_type, tlv_type)			       \
static inline const payload_type *					       \
mlxfw_mfa2_tlv_ ## name ## _get(const struct mlxfw_mfa2_file *mfa2_file,       \
				const struct mlxfw_mfa2_tlv *tlv)	       \
{									       \
	return mlxfw_mfa2_tlv_payload_get(mfa2_file, tlv,		       \
					  tlv_type, sizeof(payload_type),      \
					  false);			       \
}

#define MLXFW_MFA2_TLV_VARSIZE(name, payload_type, tlv_type)		       \
static inline const payload_type *					       \
mlxfw_mfa2_tlv_ ## name ## _get(const struct mlxfw_mfa2_file *mfa2_file,       \
				const struct mlxfw_mfa2_tlv *tlv)	       \
{									       \
	return mlxfw_mfa2_tlv_payload_get(mfa2_file, tlv,		       \
					  tlv_type, sizeof(payload_type),      \
					  true);			       \
}

#endif